diff --git a/src/dbus/qdbusabstractadaptor.cpp b/src/dbus/qdbusabstractadaptor.cpp
index 0d59efe145..4f749b0f9d 100644
--- a/src/dbus/qdbusabstractadaptor.cpp
+++ b/src/dbus/qdbusabstractadaptor.cpp
@@ -305,7 +305,7 @@ void QDBusAdaptorConnector::relay(QObject *senderObj, int lastSignalIdx, void **
         realObject = realObject->parent();
 
     // break down the parameter list
-    QList<int> types;
+    QList<QMetaType> types;
     QString errorMsg;
     int inputCount = qDBusParametersForMethod(mm, types, errorMsg);
     if (inputCount == -1) {
diff --git a/src/dbus/qdbusabstractinterface.cpp b/src/dbus/qdbusabstractinterface.cpp
index 4c580ed676..0a873ad5ad 100644
--- a/src/dbus/qdbusabstractinterface.cpp
+++ b/src/dbus/qdbusabstractinterface.cpp
@@ -154,10 +154,10 @@ bool QDBusAbstractInterfacePrivate::property(const QMetaProperty &mp, void *retu
     if (!isValid || !canMakeCalls())   // can't make calls
         return false;
 
-    const int type = mp.userType();
+    QMetaType type = mp.metaType();
     // is this metatype registered?
     const char *expectedSignature = "";
-    if (int(mp.userType()) != QMetaType::QVariant) {
+    if (type.id() != QMetaType::QVariant) {
         expectedSignature = QDBusMetaType::typeToSignature(type);
         if (expectedSignature == nullptr) {
             qWarning("QDBusAbstractInterface: type %s must be registered with Qt D-Bus before it can be "
@@ -193,10 +193,10 @@ bool QDBusAbstractInterfacePrivate::property(const QMetaProperty &mp, void *retu
     const char *foundType = nullptr;
     QVariant value = qvariant_cast<QDBusVariant>(reply.arguments().at(0)).variant();
 
-    if (value.userType() == type || type == QMetaType::QVariant
+    if (value.metaType() == type || type.id() == QMetaType::QVariant
         || (expectedSignature[0] == 'v' && expectedSignature[1] == '\0')) {
         // simple match
-        if (type == QMetaType::QVariant) {
+        if (type.id() == QMetaType::QVariant) {
             *reinterpret_cast<QVariant*>(returnValuePtr) = value;
         } else {
             QMetaType(type).destruct(returnValuePtr);
@@ -205,7 +205,7 @@ bool QDBusAbstractInterfacePrivate::property(const QMetaProperty &mp, void *retu
         return true;
     }
 
-    if (value.userType() == qMetaTypeId<QDBusArgument>()) {
+    if (value.metaType() == QMetaType::fromType<QDBusArgument>()) {
         QDBusArgument arg = qvariant_cast<QDBusArgument>(value);
 
         foundType = "user type";
@@ -216,7 +216,7 @@ bool QDBusAbstractInterfacePrivate::property(const QMetaProperty &mp, void *retu
         }
     } else {
         foundType = value.typeName();
-        foundSignature = QDBusMetaType::typeToSignature(value.userType());
+        foundSignature = QDBusMetaType::typeToSignature(value.metaType());
     }
 
     // there was an error...
@@ -281,7 +281,7 @@ int QDBusAbstractInterfaceBase::qt_metacall(QMetaObject::Call _c, int _id, void
 
         if (_c == QMetaObject::WriteProperty) {
             QVariant value;
-            if (mp.userType() == qMetaTypeId<QDBusVariant>())
+            if (mp.metaType() == QMetaType::fromType<QDBusVariant>())
                 value = reinterpret_cast<const QDBusVariant*>(_a[0])->variant();
             else
                 value = QVariant(mp.metaType(), _a[0]);
diff --git a/src/dbus/qdbusargument.cpp b/src/dbus/qdbusargument.cpp
index 840a6d9673..10baa5d907 100644
--- a/src/dbus/qdbusargument.cpp
+++ b/src/dbus/qdbusargument.cpp
@@ -96,7 +96,7 @@ QByteArray QDBusArgumentPrivate::createSignature(int id)
                  "(Did you forget to call beginStructure() ?)",
                  QMetaType(id).name(),
                  signature.constData(),
-                 QMetaType(QDBusMetaType::signatureToType(signature)).name());
+                 QDBusMetaType::signatureToMetaType(signature).name());
         return "";
     }
     return signature;
@@ -879,7 +879,7 @@ void QDBusArgument::endStructure()
 
     \sa endArray(), beginStructure(), beginMap()
 */
-void QDBusArgument::beginArray(int id)
+void QDBusArgument::beginArray(QMetaType id)
 {
     if (QDBusArgumentPrivate::checkWrite(d))
         d = d->marshaller()->beginArray(id);
@@ -916,10 +916,10 @@ void QDBusArgument::endArray()
 
     \sa endMap(), beginStructure(), beginArray(), beginMapEntry()
 */
-void QDBusArgument::beginMap(int kid, int vid)
+void QDBusArgument::beginMap(QMetaType keyMetaType, QMetaType valueMetaType)
 {
     if (QDBusArgumentPrivate::checkWrite(d))
-        d = d->marshaller()->beginMap(kid, vid);
+        d = d->marshaller()->beginMap(keyMetaType, valueMetaType);
 }
 
 /*!
diff --git a/src/dbus/qdbusargument.h b/src/dbus/qdbusargument.h
index 721ac41b3c..cf09543912 100644
--- a/src/dbus/qdbusargument.h
+++ b/src/dbus/qdbusargument.h
@@ -103,9 +103,13 @@ public:
 
     void beginStructure();
     void endStructure();
-    void beginArray(int elementMetaTypeId);
+    void beginArray(int elementMetaTypeId)
+    { beginArray(QMetaType(elementMetaTypeId)); }
+    void beginArray(QMetaType elementMetaType);
     void endArray();
-    void beginMap(int keyMetaTypeId, int valueMetaTypeId);
+    void beginMap(int keyMetaTypeId, int valueMetaTypeId)
+    { beginMap(QMetaType(keyMetaTypeId), QMetaType(valueMetaTypeId)); }
+    void beginMap(QMetaType keyMetaType, QMetaType valueMetaType);
     void endMap();
     void beginMapEntry();
     void endMapEntry();
@@ -165,8 +169,7 @@ template<typename T> inline T qdbus_cast(const QDBusArgument &arg)
 
 template<typename T> inline T qdbus_cast(const QVariant &v)
 {
-    int id = v.userType();
-    if (id == qMetaTypeId<QDBusArgument>())
+    if (v.metaType() == QMetaType::fromType<QDBusArgument>())
         return qdbus_cast<T>(qvariant_cast<QDBusArgument>(v));
     else
         return qvariant_cast<T>(v);
@@ -227,8 +230,7 @@ template<template <typename> class Container, typename T,
          typename = typename Container<T>::iterator>
 inline QDBusArgument &operator<<(QDBusArgument &arg, const Container<T> &list)
 {
-    int id = qMetaTypeId<T>();
-    arg.beginArray(id);
+    arg.beginArray(QMetaType::fromType<T>());
     typename Container<T>::const_iterator it = list.begin();
     typename Container<T>::const_iterator end = list.end();
     for ( ; it != end; ++it)
@@ -255,8 +257,7 @@ inline const QDBusArgument &operator>>(const QDBusArgument &arg, Container<T> &l
 
 inline QDBusArgument &operator<<(QDBusArgument &arg, const QVariantList &list)
 {
-    int id = qMetaTypeId<QDBusVariant>();
-    arg.beginArray(id);
+    arg.beginArray(QMetaType::fromType<QDBusVariant>());
     QVariantList::ConstIterator it = list.constBegin();
     QVariantList::ConstIterator end = list.constEnd();
     for ( ; it != end; ++it)
@@ -270,9 +271,7 @@ template <template <typename, typename> class Container, typename Key, typename
          QtPrivate::IfAssociativeIteratorHasKeyAndValue<typename Container<Key, T>::iterator> = true>
 inline QDBusArgument &operator<<(QDBusArgument &arg, const Container<Key, T> &map)
 {
-    int kid = qMetaTypeId<Key>();
-    int vid = qMetaTypeId<T>();
-    arg.beginMap(kid, vid);
+    arg.beginMap(QMetaType::fromType<Key>(), QMetaType::fromType<T>());
     auto it = map.begin();
     auto end = map.end();
     for ( ; it != end; ++it) {
@@ -288,9 +287,7 @@ template <template <typename, typename> class Container, typename Key, typename
          QtPrivate::IfAssociativeIteratorHasFirstAndSecond<typename Container<Key, T>::iterator> = true>
 inline QDBusArgument &operator<<(QDBusArgument &arg, const Container<Key, T> &map)
 {
-    int kid = qMetaTypeId<Key>();
-    int vid = qMetaTypeId<T>();
-    arg.beginMap(kid, vid);
+    arg.beginMap(QMetaType::fromType<Key>(), QMetaType::fromType<T>());
     auto it = map.begin();
     auto end = map.end();
     for ( ; it != end; ++it) {
@@ -322,7 +319,7 @@ inline const QDBusArgument &operator>>(const QDBusArgument &arg, Container<Key,
 
 inline QDBusArgument &operator<<(QDBusArgument &arg, const QVariantMap &map)
 {
-    arg.beginMap(QMetaType::QString, qMetaTypeId<QDBusVariant>());
+    arg.beginMap(QMetaType::fromType<QString>(), QMetaType::fromType<QDBusVariant>());
     QVariantMap::ConstIterator it = map.constBegin();
     QVariantMap::ConstIterator end = map.constEnd();
     for ( ; it != end; ++it) {
@@ -336,7 +333,7 @@ inline QDBusArgument &operator<<(QDBusArgument &arg, const QVariantMap &map)
 
 inline QDBusArgument &operator<<(QDBusArgument &arg, const QVariantHash &map)
 {
-    arg.beginMap(QMetaType::QString, qMetaTypeId<QDBusVariant>());
+    arg.beginMap(QMetaType::fromType<QString>(), QMetaType::fromType<QDBusVariant>());
     QVariantHash::ConstIterator it = map.constBegin();
     QVariantHash::ConstIterator end = map.constEnd();
     for ( ; it != end; ++it) {
diff --git a/src/dbus/qdbusargument_p.h b/src/dbus/qdbusargument_p.h
index 3553d3d151..5cc3ca7da2 100644
--- a/src/dbus/qdbusargument_p.h
+++ b/src/dbus/qdbusargument_p.h
@@ -129,9 +129,9 @@ public:
 
     QDBusMarshaller *beginStructure();
     QDBusMarshaller *endStructure();
-    QDBusMarshaller *beginArray(int id);
+    QDBusMarshaller *beginArray(QMetaType id);
     QDBusMarshaller *endArray();
-    QDBusMarshaller *beginMap(int kid, int vid);
+    QDBusMarshaller *beginMap(QMetaType kid, QMetaType vid);
     QDBusMarshaller *endMap();
     QDBusMarshaller *beginMapEntry();
     QDBusMarshaller *endMapEntry();
diff --git a/src/dbus/qdbusconnection_p.h b/src/dbus/qdbusconnection_p.h
index 84c5aee3d7..b8a1b7bbfd 100644
--- a/src/dbus/qdbusconnection_p.h
+++ b/src/dbus/qdbusconnection_p.h
@@ -137,7 +137,7 @@ public:
         QString service, path, signature;
         QObject* obj;
         int midx;
-        QList<int> params;
+        QList<QMetaType> params;
         ArgMatchRules argumentMatch;
         QByteArray matchRule;
     };
@@ -264,7 +264,7 @@ private:
     void sendInternal(QDBusPendingCallPrivate *pcall, void *msg, int timeout);
     void sendError(const QDBusMessage &msg, QDBusError::ErrorType code);
     void deliverCall(QObject *object, int flags, const QDBusMessage &msg,
-                     const QList<int> &metaTypes, int slotIdx);
+                     const QList<QMetaType> &metaTypes, int slotIdx);
 
     SignalHookHash::Iterator removeSignalHookNoLock(SignalHookHash::Iterator it);
     void collectAllObjects(ObjectTreeNode &node, QSet<QObject *> &set);
@@ -352,7 +352,7 @@ public:
 
 public:
     // static methods
-    static int findSlot(QObject *obj, const QByteArray &normalizedName, QList<int> &params);
+    static int findSlot(QObject *obj, const QByteArray &normalizedName, QList<QMetaType> &params);
     static bool prepareHook(QDBusConnectionPrivate::SignalHook &hook, QString &key,
                             const QString &service,
                             const QString &path, const QString &interface, const QString &name,
@@ -361,7 +361,7 @@ public:
                             bool buildSignature);
     static DBusHandlerResult messageFilter(DBusConnection *, DBusMessage *, void *);
     static QDBusCallDeliveryEvent *prepareReply(QDBusConnectionPrivate *target, QObject *object,
-                                                int idx, const QList<int> &metaTypes,
+                                                int idx, const QList<QMetaType> &metaTypes,
                                                 const QDBusMessage &msg);
     static void processFinishedCall(QDBusPendingCallPrivate *call);
 
@@ -374,11 +374,10 @@ public:
 };
 
 // in qdbusmisc.cpp
-extern int qDBusParametersForMethod(const QMetaMethod &mm, QList<int> &metaTypes,
-                                    QString &errorMsg);
+extern int qDBusParametersForMethod(const QMetaMethod &mm, QList<QMetaType> &metaTypes, QString &errorMsg);
 #    endif // QT_BOOTSTRAPPED
 extern Q_DBUS_EXPORT int qDBusParametersForMethod(const QList<QByteArray> &parameters,
-                                                  QList<int> &metaTypes, QString &errorMsg);
+                                                  QList<QMetaType> &metaTypes, QString &errorMsg);
 extern Q_DBUS_EXPORT bool qDBusCheckAsyncTag(const char *tag);
 #ifndef QT_BOOTSTRAPPED
 extern bool qDBusInterfaceInObject(QObject *obj, const QString &interface_name);
diff --git a/src/dbus/qdbusintegrator.cpp b/src/dbus/qdbusintegrator.cpp
index e177583bfa..96f2244e0c 100644
--- a/src/dbus/qdbusintegrator.cpp
+++ b/src/dbus/qdbusintegrator.cpp
@@ -668,7 +668,7 @@ static void huntAndEmit(DBusConnection *connection, DBusMessage *msg,
 }
 
 static int findSlot(const QMetaObject *mo, const QByteArray &name, int flags,
-                    const QString &signature_, QList<int> &metaTypes)
+                    const QString &signature_, QList<QMetaType> &metaTypes)
 {
     QByteArray msgSignature = signature_.toLatin1();
 
@@ -687,12 +687,12 @@ static int findSlot(const QMetaObject *mo, const QByteArray &name, int flags,
         if (mm.name() != name)
             continue;
 
-        int returnType = mm.returnType();
+        QMetaType returnType = mm.returnMetaType();
         bool isAsync = qDBusCheckAsyncTag(mm.tag());
         bool isScriptable = mm.attributes() & QMetaMethod::Scriptable;
 
         // consistency check:
-        if (isAsync && returnType != QMetaType::Void)
+        if (isAsync && returnType.id() != QMetaType::Void)
             continue;
 
         QString errorMsg;
@@ -729,7 +729,7 @@ static int findSlot(const QMetaObject *mo, const QByteArray &name, int flags,
             ++i;
 
         // make sure that the output parameters have signatures too
-        if (returnType != QMetaType::UnknownType && returnType != QMetaType::Void && QDBusMetaType::typeToSignature(returnType) == nullptr)
+        if (returnType.isValid() && returnType.id() != QMetaType::Void && QDBusMetaType::typeToSignature(returnType) == nullptr)
             continue;
 
         bool ok = true;
@@ -781,7 +781,7 @@ static QDBusCallDeliveryEvent * const DIRECT_DELIVERY = (QDBusCallDeliveryEvent
 
 QDBusCallDeliveryEvent *QDBusConnectionPrivate::prepareReply(QDBusConnectionPrivate *target,
                                                              QObject *object, int idx,
-                                                             const QList<int> &metaTypes,
+                                                             const QList<QMetaType> &metaTypes,
                                                              const QDBusMessage &msg)
 {
     Q_ASSERT(object);
@@ -796,8 +796,8 @@ QDBusCallDeliveryEvent *QDBusConnectionPrivate::prepareReply(QDBusConnectionPriv
 
     // check that types match
     for (int i = 0; i < n; ++i)
-        if (metaTypes.at(i + 1) != msg.arguments().at(i).userType() &&
-            msg.arguments().at(i).userType() != qMetaTypeId<QDBusArgument>())
+        if (metaTypes.at(i + 1) != msg.arguments().at(i).metaType() &&
+            msg.arguments().at(i).metaType() != QMetaType::fromType<QDBusArgument>())
             return nullptr;           // no match
 
     // we can deliver
@@ -917,7 +917,7 @@ bool QDBusConnectionPrivate::activateCall(QObject* object, int flags, const QDBu
 }
 
 void QDBusConnectionPrivate::deliverCall(QObject *object, int /*flags*/, const QDBusMessage &msg,
-                                         const QList<int> &metaTypes, int slotIdx)
+                                         const QList<QMetaType> &metaTypes, int slotIdx)
 {
     Q_ASSERT_X(!object || QThread::currentThread() == object->thread(),
                "QDBusConnection: internal threading error",
@@ -936,15 +936,15 @@ void QDBusConnectionPrivate::deliverCall(QObject *object, int /*flags*/, const Q
     int i;
     int pCount = qMin(msg.arguments().count(), metaTypes.count() - 1);
     for (i = 1; i <= pCount; ++i) {
-        int id = metaTypes[i];
+        auto id = metaTypes[i];
         if (id == QDBusMetaTypeId::message())
             break;
 
         const QVariant &arg = msg.arguments().at(i - 1);
-        if (arg.userType() == id)
+        if (arg.metaType() == id)
             // no conversion needed
             params.append(const_cast<void *>(arg.constData()));
-        else if (arg.userType() == qMetaTypeId<QDBusArgument>()) {
+        else if (arg.metaType() == QMetaType::fromType<QDBusArgument>()) {
             // convert to what the function expects
             auxParameters.append(QVariant(QMetaType(id)));
 
@@ -954,14 +954,14 @@ void QDBusConnectionPrivate::deliverCall(QObject *object, int /*flags*/, const Q
 
             if (Q_UNLIKELY(!QDBusMetaType::demarshall(in, out.metaType(), out.data())))
                 qFatal("Internal error: demarshalling function for type '%s' (%d) failed!",
-                       out.typeName(), out.userType());
+                       out.typeName(), out.metaType().id());
 
             params.append(const_cast<void *>(out.constData()));
         } else {
             qFatal("Internal error: got invalid meta type %d (%s) "
                    "when trying to convert to meta type %d (%s)",
-                   arg.userType(), arg.metaType().name(),
-                   id, QMetaType(id).name());
+                   arg.metaType().id(), arg.metaType().name(),
+                   id.id(), id.name());
         }
     }
 
@@ -973,7 +973,7 @@ void QDBusConnectionPrivate::deliverCall(QObject *object, int /*flags*/, const Q
     // output arguments
     const int numMetaTypes = metaTypes.count();
     QVariantList outputArgs;
-    if (metaTypes[0] != QMetaType::Void && metaTypes[0] != QMetaType::UnknownType) {
+    if (metaTypes[0].id() != QMetaType::Void && metaTypes[0].isValid()) {
         outputArgs.reserve(numMetaTypes - i + 1);
         QVariant arg{QMetaType(metaTypes[0])};
         outputArgs.append( arg );
@@ -1315,7 +1315,7 @@ void QDBusConnectionPrivate::serviceOwnerChangedNoLock(const QString &name,
 }
 
 int QDBusConnectionPrivate::findSlot(QObject *obj, const QByteArray &normalizedName,
-                                     QList<int> &params)
+                                     QList<QMetaType> &params)
 {
     int midx = obj->metaObject()->indexOfMethod(normalizedName);
     if (midx == -1)
@@ -1703,7 +1703,7 @@ void QDBusConnectionPrivate::watchForDBusDisconnection()
     hook.service.clear(); // org.freedesktop.DBus.Local.Disconnected uses empty service name
     hook.path = QDBusUtil::dbusPathLocal();
     hook.obj = this;
-    hook.params << QMetaType::Void;
+    hook.params << QMetaType(QMetaType::Void);
     hook.midx = staticMetaObject.indexOfSlot("handleDBusDisconnection()");
     Q_ASSERT(hook.midx != -1);
     signalHooks.insert(QLatin1String("Disconnected:" DBUS_INTERFACE_LOCAL), hook);
@@ -1840,7 +1840,7 @@ void QDBusConnectionPrivate::setConnection(DBusConnection *dbc, const QDBusError
     hook.service = QDBusUtil::dbusService();
     hook.path.clear(); // no matching
     hook.obj = this;
-    hook.params << QMetaType::Void << QMetaType::QString; // both functions take a QString as parameter and return void
+    hook.params << QMetaType(QMetaType::Void) << QMetaType(QMetaType::QString); // both functions take a QString as parameter and return void
 
     hook.midx = staticMetaObject.indexOfSlot("registerServiceNoLock(QString)");
     Q_ASSERT(hook.midx != -1);
@@ -1854,7 +1854,7 @@ void QDBusConnectionPrivate::setConnection(DBusConnection *dbc, const QDBusError
     // we don't use connectSignal here because the rules are added by connectSignal on a per-need basis
     hook.params.clear();
     hook.params.reserve(4);
-    hook.params << QMetaType::Void << QMetaType::QString << QMetaType::QString << QMetaType::QString;
+    hook.params << QMetaType(QMetaType::Void) << QMetaType(QMetaType::QString) << QMetaType(QMetaType::QString) << QMetaType(QMetaType::QString);
     hook.midx = staticMetaObject.indexOfSlot("serviceOwnerChangedNoLock(QString,QString,QString)");
     Q_ASSERT(hook.midx != -1);
     signalHooks.insert(QLatin1String("NameOwnerChanged:" DBUS_INTERFACE_DBUS), hook);
diff --git a/src/dbus/qdbusintegrator_p.h b/src/dbus/qdbusintegrator_p.h
index be6efa4027..3a459251f7 100644
--- a/src/dbus/qdbusintegrator_p.h
+++ b/src/dbus/qdbusintegrator_p.h
@@ -84,7 +84,7 @@ struct QDBusSlotCache
     {
         int flags;
         int slotIdx;
-        QList<int> metaTypes;
+        QList<QMetaType> metaTypes;
 
         void swap(Data &other) noexcept
         {
@@ -105,7 +105,7 @@ class QDBusCallDeliveryEvent: public QAbstractMetaCallEvent
 {
 public:
     QDBusCallDeliveryEvent(const QDBusConnection &c, int id, QObject *sender,
-                           const QDBusMessage &msg, const QList<int> &types, int f = 0)
+                           const QDBusMessage &msg, const QList<QMetaType> &types, int f = 0)
         : QAbstractMetaCallEvent(sender, -1),
           connection(c),
           message(msg),
@@ -123,7 +123,7 @@ public:
 private:
     QDBusConnection connection; // just for refcounting
     QDBusMessage message;
-    QList<int> metaTypes;
+    QList<QMetaType> metaTypes;
     int id;
     int flags;
 };
diff --git a/src/dbus/qdbusinterface.cpp b/src/dbus/qdbusinterface.cpp
index e80dbdf0e0..3d6cf6c1f2 100644
--- a/src/dbus/qdbusinterface.cpp
+++ b/src/dbus/qdbusinterface.cpp
@@ -53,7 +53,7 @@ QT_BEGIN_NAMESPACE
 
 static void copyArgument(void *to, int id, const QVariant &arg)
 {
-    if (id == arg.userType()) {
+    if (id == arg.metaType().id()) {
         switch (id) {
         case QMetaType::Bool:
             *reinterpret_cast<bool *>(to) = arg.toBool();
@@ -104,13 +104,13 @@ static void copyArgument(void *to, int id, const QVariant &arg)
             return;
         }
 
-        if (id == QDBusMetaTypeId::variant()) {
+        if (id == QDBusMetaTypeId::variant().id()) {
             *reinterpret_cast<QDBusVariant *>(to) = qvariant_cast<QDBusVariant>(arg);
             return;
-        } else if (id == QDBusMetaTypeId::objectpath()) {
+        } else if (id == QDBusMetaTypeId::objectpath().id()) {
             *reinterpret_cast<QDBusObjectPath *>(to) = qvariant_cast<QDBusObjectPath>(arg);
             return;
-        } else if (id == QDBusMetaTypeId::signature()) {
+        } else if (id == QDBusMetaTypeId::signature().id()) {
             *reinterpret_cast<QDBusSignature *>(to) = qvariant_cast<QDBusSignature>(arg);
             return;
         }
@@ -121,14 +121,14 @@ static void copyArgument(void *to, int id, const QVariant &arg)
     }
 
     // if we got here, it's either an un-dermarshalled type or a mismatch
-    if (arg.userType() != QDBusMetaTypeId::argument()) {
+    if (arg.metaType() != QDBusMetaTypeId::argument()) {
         // it's a mismatch
         //qWarning?
         return;
     }
 
     // is this type registered?
-    const char *userSignature = QDBusMetaType::typeToSignature(id);
+    const char *userSignature = QDBusMetaType::typeToSignature(QMetaType(id));
     if (!userSignature || !*userSignature) {
         // type not registered
         //qWarning?
diff --git a/src/dbus/qdbusinternalfilters.cpp b/src/dbus/qdbusinternalfilters.cpp
index 7b99cbd917..4d8d4ca254 100644
--- a/src/dbus/qdbusinternalfilters.cpp
+++ b/src/dbus/qdbusinternalfilters.cpp
@@ -348,28 +348,28 @@ static int writeProperty(QObject *obj, const QByteArray &property_name, QVariant
 
     // we found our property
     // do we have the right type?
-    int id = mp.userType();
-    if (!id){
+    QMetaType id = mp.metaType();
+    if (!id.isValid()){
         // type not registered or invalid / void?
         qWarning("QDBusConnection: Unable to handle unregistered datatype '%s' for property '%s::%s'",
                  mp.typeName(), mo->className(), property_name.constData());
         return PropertyWriteFailed;
     }
 
-    if (id != QMetaType::QVariant && value.userType() == QDBusMetaTypeId::argument()) {
+    if (id.id() != QMetaType::QVariant && value.metaType() == QDBusMetaTypeId::argument()) {
         // we have to demarshall before writing
         QVariant other{QMetaType(id)};
         if (!QDBusMetaType::demarshall(qvariant_cast<QDBusArgument>(value), other.metaType(), other.data())) {
             qWarning("QDBusConnection: type `%s' (%d) is not registered with QtDBus. "
                      "Use qDBusRegisterMetaType to register it",
-                     mp.typeName(), id);
+                     mp.typeName(), id.id());
             return PropertyWriteFailed;
         }
 
         value = other;
     }
 
-    if (mp.userType() == qMetaTypeId<QDBusVariant>())
+    if (mp.metaType() == QMetaType::fromType<QDBusVariant>())
         value = QVariant::fromValue(QDBusVariant(value));
 
     // the property type here should match
@@ -456,10 +456,10 @@ static QVariantMap readAllProperties(QObject *object, int flags)
             continue;
 
         // is it a registered property?
-        int typeId = mp.userType();
-        if (!typeId)
+        QMetaType type = mp.metaType();
+        if (!type.isValid())
             continue;
-        const char *signature = QDBusMetaType::typeToSignature(typeId);
+        const char *signature = QDBusMetaType::typeToSignature(type);
         if (!signature)
             continue;
 
diff --git a/src/dbus/qdbusmarshaller.cpp b/src/dbus/qdbusmarshaller.cpp
index 5e25e4913b..4977d7b265 100644
--- a/src/dbus/qdbusmarshaller.cpp
+++ b/src/dbus/qdbusmarshaller.cpp
@@ -189,8 +189,8 @@ inline bool QDBusMarshaller::append(const QDBusVariant &arg)
     }
 
     const QVariant &value = arg.variant();
-    int id = value.userType();
-    if (id == QMetaType::UnknownType) {
+    QMetaType id = value.metaType();
+    if (!id.isValid()) {
         qWarning("QDBusMarshaller: cannot add a null QDBusVariant");
         error(QLatin1String("Variant containing QVariant::Invalid passed in arguments"));
         return false;
@@ -210,9 +210,9 @@ inline bool QDBusMarshaller::append(const QDBusVariant &arg)
     if (!signature) {
         qWarning("QDBusMarshaller: type `%s' (%d) is not registered with D-BUS. "
                  "Use qDBusRegisterMetaType to register it",
-                 QMetaType(id).name(), id);
+                 id.name(), id.id());
         error(QLatin1String("Unregistered type %1 passed in arguments")
-              .arg(QLatin1String(QMetaType(id).name())));
+              .arg(QLatin1String(id.name())));
         return false;
     }
 
@@ -246,46 +246,46 @@ inline QDBusMarshaller *QDBusMarshaller::beginStructure()
     return beginCommon(DBUS_TYPE_STRUCT, nullptr);
 }
 
-inline QDBusMarshaller *QDBusMarshaller::beginArray(int id)
+inline QDBusMarshaller *QDBusMarshaller::beginArray(QMetaType id)
 {
-    const char *signature = QDBusMetaType::typeToSignature( QVariant::Type(id) );
+    const char *signature = QDBusMetaType::typeToSignature(id);
     if (!signature) {
         qWarning("QDBusMarshaller: type `%s' (%d) is not registered with D-BUS. "
                  "Use qDBusRegisterMetaType to register it",
-                 QMetaType(id).name(), id);
+                 id.name(), id.id());
         error(QLatin1String("Unregistered type %1 passed in arguments")
-              .arg(QLatin1String(QMetaType(id).name())));
+              .arg(QLatin1String(id.name())));
         return this;
     }
 
     return beginCommon(DBUS_TYPE_ARRAY, signature);
 }
 
-inline QDBusMarshaller *QDBusMarshaller::beginMap(int kid, int vid)
+inline QDBusMarshaller *QDBusMarshaller::beginMap(QMetaType kid, QMetaType vid)
 {
-    const char *ksignature = QDBusMetaType::typeToSignature( QVariant::Type(kid) );
+    const char *ksignature = QDBusMetaType::typeToSignature(kid);
     if (!ksignature) {
         qWarning("QDBusMarshaller: type `%s' (%d) is not registered with D-BUS. "
                  "Use qDBusRegisterMetaType to register it",
-                 QMetaType(kid).name(), kid);
+                 kid.name(), kid.id());
         error(QLatin1String("Unregistered type %1 passed in arguments")
-              .arg(QLatin1String(QMetaType(kid).name())));
+              .arg(QLatin1String(kid.name())));
         return this;
     }
     if (ksignature[1] != 0 || !QDBusUtil::isValidBasicType(*ksignature)) {
         qWarning("QDBusMarshaller: type '%s' (%d) cannot be used as the key type in a D-BUS map.",
-                 QMetaType(kid).name(), kid);
+                 kid.name(), kid.id());
         error(QLatin1String("Type %1 passed in arguments cannot be used as a key in a map")
-              .arg(QLatin1String(QMetaType(kid).name())));
+              .arg(QLatin1String(kid.name())));
         return this;
     }
 
-    const char *vsignature = QDBusMetaType::typeToSignature( QVariant::Type(vid) );
+    const char *vsignature = QDBusMetaType::typeToSignature(vid);
     if (!vsignature) {
-        const char *typeName = QMetaType(vid).name();
+        const char *typeName = vid.name();
         qWarning("QDBusMarshaller: type `%s' (%d) is not registered with D-BUS. "
                  "Use qDBusRegisterMetaType to register it",
-                 typeName, vid);
+                 typeName, vid.id());
         error(QLatin1String("Unregistered type %1 passed in arguments")
               .arg(QLatin1String(typeName)));
         return this;
@@ -383,8 +383,8 @@ void QDBusMarshaller::error(const QString &msg)
 
 bool QDBusMarshaller::appendVariantInternal(const QVariant &arg)
 {
-    int id = arg.userType();
-    if (id == QMetaType::UnknownType) {
+    QMetaType id = arg.metaType();
+    if (!id.isValid()) {
         qWarning("QDBusMarshaller: cannot add an invalid QVariant");
         error(QLatin1String("Variant containing QVariant::Invalid passed in arguments"));
         return false;
@@ -412,13 +412,13 @@ bool QDBusMarshaller::appendVariantInternal(const QVariant &arg)
         return appendCrossMarshalling(&demarshaller);
     }
 
-    const char *signature = QDBusMetaType::typeToSignature( QVariant::Type(id) );
+    const char *signature = QDBusMetaType::typeToSignature(id);
     if (!signature) {
         qWarning("QDBusMarshaller: type `%s' (%d) is not registered with D-BUS. "
                  "Use qDBusRegisterMetaType to register it",
-                 QMetaType(id).name(), id);
+                 id.name(), id.id());
         error(QLatin1String("Unregistered type %1 passed in arguments")
-              .arg(QLatin1String(QMetaType(id).name())));
+              .arg(QLatin1String(id.name())));
         return false;
     }
 
@@ -485,7 +485,7 @@ bool QDBusMarshaller::appendVariantInternal(const QVariant &arg)
     case DBUS_TYPE_ARRAY:
         // could be many things
         // find out what kind of array it is
-        switch (arg.userType()) {
+        switch (arg.metaType().id()) {
         case QMetaType::QStringList:
             append( arg.toStringList() );
             return true;
diff --git a/src/dbus/qdbusmessage.cpp b/src/dbus/qdbusmessage.cpp
index 118b31c1e1..eb3ca3a909 100644
--- a/src/dbus/qdbusmessage.cpp
+++ b/src/dbus/qdbusmessage.cpp
@@ -274,10 +274,10 @@ QDBusMessage QDBusMessagePrivate::makeLocal(const QDBusConnectionPrivate &conn,
     QVariantList::ConstIterator it = asSent.d_ptr->arguments.constBegin();
     QVariantList::ConstIterator end = asSent.d_ptr->arguments.constEnd();
     for ( ; it != end; ++it) {
-        int id = it->userType();
+        QMetaType id = it->metaType();
         const char *signature = QDBusMetaType::typeToSignature(id);
-        if ((id != QMetaType::QStringList && id != QMetaType::QByteArray &&
-             qstrlen(signature) != 1) || id == qMetaTypeId<QDBusVariant>()) {
+        if ((id.id() != QMetaType::QStringList && id.id() != QMetaType::QByteArray &&
+             qstrlen(signature) != 1) || id == QMetaType::fromType<QDBusVariant>()) {
             // yes, we are
             // we must marshall and demarshall again so as to create QDBusArgument
             // entries for the complex types
diff --git a/src/dbus/qdbusmessage.h b/src/dbus/qdbusmessage.h
index cd8f74d8bc..17ca8cf06d 100644
--- a/src/dbus/qdbusmessage.h
+++ b/src/dbus/qdbusmessage.h
@@ -45,7 +45,7 @@
 #include <QtCore/qlist.h>
 #include <QtCore/qvariant.h>
 
-#ifndef QT_NO_DBUS
+#if !defined(QT_NO_DBUS) && !defined(QT_BOOTSTRAPPED)
 
 #if defined(Q_OS_WIN) && defined(interface)
 #  undef interface
@@ -53,7 +53,6 @@
 
 QT_BEGIN_NAMESPACE
 
-
 class QDBusMessagePrivate;
 class Q_DBUS_EXPORT QDBusMessage
 {
diff --git a/src/dbus/qdbusmetaobject.cpp b/src/dbus/qdbusmetaobject.cpp
index dee885395a..8ca5e0b5ba 100644
--- a/src/dbus/qdbusmetaobject.cpp
+++ b/src/dbus/qdbusmetaobject.cpp
@@ -170,7 +170,7 @@ QDBusMetaObjectGenerator::findType(const QByteArray &signature,
     Type result;
     result.id = QMetaType::UnknownType;
 
-    int type = QDBusMetaType::signatureToType(signature);
+    int type = QDBusMetaType::signatureToMetaType(signature).id();
     if (type == QMetaType::UnknownType && !qt_dbus_metaobject_skip_annotations) {
         // it's not a type normally handled by our meta type system
         // it must contain an annotation
@@ -199,7 +199,7 @@ QDBusMetaObjectGenerator::findType(const QByteArray &signature,
             type = QMetaType::fromName(typeName).id();
         }
 
-        if (type == QMetaType::UnknownType || signature != QDBusMetaType::typeToSignature(type)) {
+        if (type == QMetaType::UnknownType || signature != QDBusMetaType::typeToSignature(QMetaType(type))) {
             // type is still unknown or doesn't match back to the signature that it
             // was expected to, so synthesize a fake type
             typeName = "QDBusRawType<0x" + signature.toHex() + ">*";
diff --git a/src/dbus/qdbusmetatype.cpp b/src/dbus/qdbusmetatype.cpp
index 0c2dae18a2..083a20d8b3 100644
--- a/src/dbus/qdbusmetatype.cpp
+++ b/src/dbus/qdbusmetatype.cpp
@@ -303,7 +303,7 @@ bool QDBusMetaType::demarshall(const QDBusArgument &arg, QMetaType metaType, voi
     Note: this function only handles the basic D-Bus types.
 
     \sa QDBusUtil::isValidSingleSignature(), typeToSignature(),
-        QVariant::type(), QVariant::userType()
+        QVariant::metaType()
 */
 QMetaType QDBusMetaType::signatureToMetaType(const char *signature)
 {
@@ -388,7 +388,7 @@ QMetaType QDBusMetaType::signatureToMetaType(const char *signature)
     More types can be registered with the qDBusRegisterMetaType() function.
 
     \sa QDBusUtil::isValidSingleSignature(), signatureToType(),
-        QVariant::type(), QVariant::userType()
+        QVariant::metaType()
 */
 const char *QDBusMetaType::typeToSignature(QMetaType type)
 {
diff --git a/src/dbus/qdbusmetatype.h b/src/dbus/qdbusmetatype.h
index 4898db3080..1de3df9e88 100644
--- a/src/dbus/qdbusmetatype.h
+++ b/src/dbus/qdbusmetatype.h
@@ -60,10 +60,6 @@ public:
     static bool demarshall(const QDBusArgument &, QMetaType id, void *data);
 
     static QMetaType signatureToMetaType(const char *signature);
-    static int signatureToType(const char *signature)
-    { return signatureToMetaType(signature).id(); }
-    static const char *typeToSignature(int type)
-    { return typeToSignature(QMetaType(type)); }
     static const char *typeToSignature(QMetaType type);
 };
 
diff --git a/src/dbus/qdbusmetatype_p.h b/src/dbus/qdbusmetatype_p.h
index 39deaf9f2f..71a621b059 100644
--- a/src/dbus/qdbusmetatype_p.h
+++ b/src/dbus/qdbusmetatype_p.h
@@ -66,37 +66,37 @@ QT_BEGIN_NAMESPACE
 
 struct QDBusMetaTypeId
 {
-    static int message();         // QDBusMessage
-    static int argument();        // QDBusArgument
-    static int variant();         // QDBusVariant
-    static int objectpath();      // QDBusObjectPath
-    static int signature();       // QDBusSignature
-    static int error();           // QDBusError
-    static int unixfd();          // QDBusUnixFileDescriptor
+    static QMetaType message();         // QDBusMessage
+    static QMetaType argument();        // QDBusArgument
+    static QMetaType variant();         // QDBusVariant
+    static QMetaType objectpath();      // QDBusObjectPath
+    static QMetaType signature();       // QDBusSignature
+    static QMetaType error();           // QDBusError
+    static QMetaType unixfd();          // QDBusUnixFileDescriptor
 
     static void init();
 };
 
-inline int QDBusMetaTypeId::message()
-{ return qMetaTypeId<QDBusMessage>(); }
+inline QMetaType QDBusMetaTypeId::message()
+{ return QMetaType::fromType<QDBusMessage>(); }
 
-inline int QDBusMetaTypeId::argument()
-{ return qMetaTypeId<QDBusArgument>(); }
+inline QMetaType QDBusMetaTypeId::argument()
+{ return QMetaType::fromType<QDBusArgument>(); }
 
-inline int QDBusMetaTypeId::variant()
-{ return qMetaTypeId<QDBusVariant>(); }
+inline QMetaType QDBusMetaTypeId::variant()
+{ return QMetaType::fromType<QDBusVariant>(); }
 
-inline int QDBusMetaTypeId::objectpath()
-{ return qMetaTypeId<QDBusObjectPath>(); }
+inline QMetaType QDBusMetaTypeId::objectpath()
+{ return QMetaType::fromType<QDBusObjectPath>(); }
 
-inline int QDBusMetaTypeId::signature()
-{ return qMetaTypeId<QDBusSignature>(); }
+inline QMetaType QDBusMetaTypeId::signature()
+{ return QMetaType::fromType<QDBusSignature>(); }
 
-inline int QDBusMetaTypeId::error()
-{ return qMetaTypeId<QDBusError>(); }
+inline QMetaType QDBusMetaTypeId::error()
+{ return QMetaType::fromType<QDBusError>(); }
 
-inline int QDBusMetaTypeId::unixfd()
-{ return qMetaTypeId<QDBusUnixFileDescriptor>(); }
+inline QMetaType QDBusMetaTypeId::unixfd()
+{ return QMetaType::fromType<QDBusUnixFileDescriptor>(); }
 
 QT_END_NAMESPACE
 
diff --git a/src/dbus/qdbusmisc.cpp b/src/dbus/qdbusmisc.cpp
index c653e71097..29d13ca40b 100644
--- a/src/dbus/qdbusmisc.cpp
+++ b/src/dbus/qdbusmisc.cpp
@@ -135,20 +135,20 @@ bool qDBusInterfaceInObject(QObject *obj, const QString &interface_name)
 // metaTypes.count() >= retval + 1 in all cases
 //
 // sig must be the normalised signature for the method
-int qDBusParametersForMethod(const QMetaMethod &mm, QList<int> &metaTypes, QString &errorMsg)
+int qDBusParametersForMethod(const QMetaMethod &mm, QList<QMetaType> &metaTypes, QString &errorMsg)
 {
     return qDBusParametersForMethod(mm.parameterTypes(), metaTypes, errorMsg);
 }
 
 #endif // QT_BOOTSTRAPPED
 
-int qDBusParametersForMethod(const QList<QByteArray> &parameterTypes, QList<int> &metaTypes,
+int qDBusParametersForMethod(const QList<QByteArray> &parameterTypes, QList<QMetaType> &metaTypes,
                              QString &errorMsg)
 {
     QDBusMetaTypeId::init();
     metaTypes.clear();
 
-    metaTypes.append(0);        // return type
+    metaTypes.append(QMetaType());        // return type
     int inputCount = 0;
     bool seenMessage = false;
     QList<QByteArray>::ConstIterator it = parameterTypes.constBegin();
@@ -164,14 +164,14 @@ int qDBusParametersForMethod(const QList<QByteArray> &parameterTypes, QList<int>
             QByteArray basictype = type;
             basictype.truncate(type.length() - 1);
 
-            int id = QMetaType::fromName(basictype).id();
-            if (id == 0) {
+            QMetaType id = QMetaType::fromName(basictype);
+            if (!id.isValid()) {
                 errorMsg = QLatin1String("Unregistered output type in parameter list: ") + QLatin1String(type);
                 return -1;
             } else if (QDBusMetaType::typeToSignature(id) == nullptr)
                 return -1;
 
-            metaTypes.append( id );
+            metaTypes.append(id);
             seenMessage = true; // it cannot appear anymore anyways
             continue;
         }
@@ -184,7 +184,7 @@ int qDBusParametersForMethod(const QList<QByteArray> &parameterTypes, QList<int>
         if (type.startsWith("QVector<"))
             type = "QList<" + type.mid(sizeof("QVector<") - 1);
 
-        int id = QMetaType::fromName(type).id();
+        QMetaType id = QMetaType::fromName(type);
 #ifdef QT_BOOTSTRAPPED
         // in bootstrap mode QDBusMessage isn't included, thus we need to resolve it manually here
         if (type == "QDBusMessage") {
@@ -192,7 +192,7 @@ int qDBusParametersForMethod(const QList<QByteArray> &parameterTypes, QList<int>
         }
 #endif
 
-        if (id == QMetaType::UnknownType) {
+        if (!id.isValid()) {
             errorMsg = QLatin1String("Unregistered input type in parameter list: ") + QLatin1String(type);
             return -1;
         }
diff --git a/src/dbus/qdbuspendingcall.cpp b/src/dbus/qdbuspendingcall.cpp
index 9bfdc8edce..34f5f9fac3 100644
--- a/src/dbus/qdbuspendingcall.cpp
+++ b/src/dbus/qdbuspendingcall.cpp
@@ -185,7 +185,7 @@ bool QDBusPendingCallPrivate::setReplyCallback(QObject *target, const char *memb
     return true;
 }
 
-void QDBusPendingCallPrivate::setMetaTypes(int count, const int *types)
+void QDBusPendingCallPrivate::setMetaTypes(int count, const QMetaType *types)
 {
     if (count == 0) {
         expectedReplySignature = QLatin1String(""); // not null
@@ -196,10 +196,8 @@ void QDBusPendingCallPrivate::setMetaTypes(int count, const int *types)
     sig.reserve(count + count / 2);
     for (int i = 0; i < count; ++i) {
         const char *typeSig = QDBusMetaType::typeToSignature(types[i]);
-        if (Q_UNLIKELY(!typeSig)) {
-            qFatal("QDBusPendingReply: type %s is not registered with QtDBus",
-                   QMetaType(types[i]).name());
-        }
+        if (Q_UNLIKELY(!typeSig))
+            qFatal("QDBusPendingReply: type %s is not registered with QtDBus", types[i].name());
         sig += typeSig;
     }
 
diff --git a/src/dbus/qdbuspendingcall_p.h b/src/dbus/qdbuspendingcall_p.h
index 0921d7c4f3..8d53b0e665 100644
--- a/src/dbus/qdbuspendingcall_p.h
+++ b/src/dbus/qdbuspendingcall_p.h
@@ -82,7 +82,7 @@ public:
 
     // for the callback mechanism (see setReplyCallback and QDBusConnectionPrivate::sendWithReplyAsync)
     QPointer<QObject> receiver;
-    QList<int> metaTypes;
+    QList<QMetaType> metaTypes;
     int methodIdx;
 
     // }
@@ -104,7 +104,7 @@ public:
     ~QDBusPendingCallPrivate();
     bool setReplyCallback(QObject *target, const char *member);
     void waitForFinished();
-    void setMetaTypes(int count, const int *types);
+    void setMetaTypes(int count, const QMetaType *types);
     void checkReceivedSignature();
 
     static QDBusPendingCall fromMessage(const QDBusMessage &msg);
diff --git a/src/dbus/qdbuspendingreply.cpp b/src/dbus/qdbuspendingreply.cpp
index f83b3d27a2..7499938184 100644
--- a/src/dbus/qdbuspendingreply.cpp
+++ b/src/dbus/qdbuspendingreply.cpp
@@ -275,7 +275,7 @@ QVariant QDBusPendingReplyBase::argumentAt(int index) const
     return d->replyMessage.arguments().value(index);
 }
 
-void QDBusPendingReplyBase::setMetaTypes(int count, const int *types)
+void QDBusPendingReplyBase::setMetaTypes(int count, const QMetaType *types)
 {
     Q_ASSERT(d);
     const auto locker = qt_scoped_lock(d->mutex);
diff --git a/src/dbus/qdbuspendingreply.h b/src/dbus/qdbuspendingreply.h
index 18c02508a0..be1d9b89e1 100644
--- a/src/dbus/qdbuspendingreply.h
+++ b/src/dbus/qdbuspendingreply.h
@@ -58,7 +58,7 @@ protected:
     void assign(const QDBusMessage &message);
 
     QVariant argumentAt(int index) const;
-    void setMetaTypes(int count, const int *metaTypes);
+    void setMetaTypes(int count, const QMetaType *metaTypes);
 };
 
 namespace QDBusPendingReplyTypes {
@@ -144,7 +144,7 @@ private:
         if constexpr (Count == 0) {
                 setMetaTypes(0, nullptr);
         } else {
-            std::array<int, Count> typeIds = { QDBusPendingReplyTypes::metaTypeFor<Types>().id()... };
+            std::array<QMetaType, Count> typeIds = { QDBusPendingReplyTypes::metaTypeFor<Types>()... };
             setMetaTypes(Count, typeIds.data());
         }
     }
diff --git a/src/dbus/qdbusreply.cpp b/src/dbus/qdbusreply.cpp
index a0556f6559..1a3278ff52 100644
--- a/src/dbus/qdbusreply.cpp
+++ b/src/dbus/qdbusreply.cpp
@@ -203,17 +203,17 @@ void qDBusReplyFill(const QDBusMessage &reply, QDBusError &error, QVariant &data
         return;
     }
 
-    if (reply.arguments().count() >= 1 && reply.arguments().at(0).userType() == data.userType()) {
+    if (reply.arguments().count() >= 1 && reply.arguments().at(0).metaType() == data.metaType()) {
         data = reply.arguments().at(0);
         return;
     }
 
-    const char *expectedSignature = QDBusMetaType::typeToSignature(data.userType());
+    const char *expectedSignature = QDBusMetaType::typeToSignature(data.metaType());
     const char *receivedType = nullptr;
     QByteArray receivedSignature;
 
     if (reply.arguments().count() >= 1) {
-        if (reply.arguments().at(0).userType() == QDBusMetaTypeId::argument()) {
+        if (reply.arguments().at(0).metaType() == QDBusMetaTypeId::argument()) {
             // compare signatures instead
             QDBusArgument arg = qvariant_cast<QDBusArgument>(reply.arguments().at(0));
             receivedSignature = arg.currentSignature().toLatin1();
@@ -224,8 +224,8 @@ void qDBusReplyFill(const QDBusMessage &reply, QDBusError &error, QVariant &data
             }
         } else {
             // not an argument and doesn't match?
-            int type = reply.arguments().at(0).userType();
-            receivedType = QMetaType(type).name();
+            QMetaType type = reply.arguments().at(0).metaType();
+            receivedType = type.name();
             receivedSignature = QDBusMetaType::typeToSignature(type);
         }
     }
diff --git a/src/dbus/qdbusutil.cpp b/src/dbus/qdbusutil.cpp
index 5152e4154e..8322ff02c4 100644
--- a/src/dbus/qdbusutil.cpp
+++ b/src/dbus/qdbusutil.cpp
@@ -80,7 +80,7 @@ static bool argToString(const QDBusArgument &arg, QString &out);
 
 static bool variantToString(const QVariant &arg, QString &out)
 {
-    int argType = arg.userType();
+    int argType = arg.metaType().id();
 
     if (argType == QMetaType::QStringList) {
         out += QLatin1Char('{');
@@ -138,11 +138,11 @@ static bool variantToString(const QVariant &arg, QString &out)
     } else if (argType == qMetaTypeId<QDBusVariant>()) {
         const QVariant v = qvariant_cast<QDBusVariant>(arg).variant();
         out += QLatin1String("[Variant");
-        int vUserType = v.userType();
-        if (vUserType != qMetaTypeId<QDBusVariant>()
-                && vUserType != qMetaTypeId<QDBusSignature>()
-                && vUserType != qMetaTypeId<QDBusObjectPath>()
-                && vUserType != qMetaTypeId<QDBusArgument>())
+        QMetaType vUserType = v.metaType();
+        if (vUserType != QMetaType::fromType<QDBusVariant>()
+                && vUserType != QMetaType::fromType<QDBusSignature>()
+                && vUserType != QMetaType::fromType<QDBusObjectPath>()
+                && vUserType != QMetaType::fromType<QDBusArgument>())
             out += QLatin1Char('(') + QLatin1String(v.typeName()) + QLatin1Char(')');
         out += QLatin1String(": ");
         if (!variantToString(v, out))
diff --git a/src/dbus/qdbusxmlgenerator.cpp b/src/dbus/qdbusxmlgenerator.cpp
index 7afeb66e09..35ca4b0b2d 100644
--- a/src/dbus/qdbusxmlgenerator.cpp
+++ b/src/dbus/qdbusxmlgenerator.cpp
@@ -101,10 +101,10 @@ static QString generateInterfaceXml(const QMetaObject *mo, int flags, int method
                   (!mp.isScriptable() && (flags & QDBusConnection::ExportNonScriptableProperties))))
                 continue;
 
-            int typeId = mp.userType();
-            if (!typeId)
+            QMetaType type = mp.metaType();
+            if (!type.isValid())
                 continue;
-            const char *signature = QDBusMetaType::typeToSignature(typeId);
+            const char *signature = QDBusMetaType::typeToSignature(type);
             if (!signature)
                 continue;
 
@@ -113,8 +113,8 @@ static QString generateInterfaceXml(const QMetaObject *mo, int flags, int method
                            QLatin1String(signature),
                            accessAsString(mp.isReadable(), mp.isWritable()));
 
-            if (QDBusMetaType::signatureToType(signature) == QMetaType::UnknownType) {
-                const char *typeName = QMetaType(typeId).name();
+            if (!QDBusMetaType::signatureToMetaType(signature).isValid()) {
+                const char *typeName = type.name();
                 retval += QLatin1String(">\n      <annotation name=\"org.qtproject.QtDBus.QtTypeName\" value=\"%3\"/>\n    </property>\n")
                           .arg(typeNameToXml(typeName));
             } else {
@@ -153,29 +153,29 @@ static QString generateInterfaceXml(const QMetaObject *mo, int flags, int method
                                         isSignal ? "signal" : "method", mm.name().constData());
 
         // check the return type first
-        int typeId = mm.returnType();
-        if (typeId != QMetaType::UnknownType && typeId != QMetaType::Void) {
+        QMetaType typeId = mm.returnMetaType();
+        if (typeId.isValid() && typeId.id() != QMetaType::Void) {
             const char *typeName = QDBusMetaType::typeToSignature(typeId);
             if (typeName) {
                 xml += QLatin1String("      <arg type=\"%1\" direction=\"out\"/>\n")
                        .arg(typeNameToXml(typeName));
 
                 // do we need to describe this argument?
-                if (QDBusMetaType::signatureToType(typeName) == QMetaType::UnknownType)
+                if (!QDBusMetaType::signatureToMetaType(typeName).isValid())
                     xml += QLatin1String("      <annotation name=\"org.qtproject.QtDBus.QtTypeName.Out0\" value=\"%1\"/>\n")
                         .arg(typeNameToXml(QMetaType(typeId).name()));
             } else {
-                qWarning() << "Unsupported return type" << typeId << QMetaType(typeId).name() << "in method" << mm.name();
+                qWarning() << "Unsupported return type" << typeId.id() << typeId.name() << "in method" << mm.name();
                 continue;
             }
         }
-        else if (typeId == QMetaType::UnknownType) {
+        else if (!typeId.isValid()) {
             qWarning() << "Invalid return type in method" << mm.name();
             continue;           // wasn't a valid type
         }
 
         QList<QByteArray> names = mm.parameterNames();
-        QList<int> types;
+        QList<QMetaType> types;
         QString errorMsg;
         int inputCount = qDBusParametersForMethod(mm, types, errorMsg);
         if (inputCount == -1) {
@@ -208,7 +208,7 @@ static QString generateInterfaceXml(const QMetaObject *mo, int flags, int method
                                      qUtf16Printable(name), signature, isOutput ? "out" : "in");
 
             // do we need to describe this argument?
-            if (QDBusMetaType::signatureToType(signature) == QMetaType::UnknownType) {
+            if (!QDBusMetaType::signatureToMetaType(signature).isValid()) {
                 const char *typeName = QMetaType(types.at(j)).name();
                 xml += QString::fromLatin1("      <annotation name=\"org.qtproject.QtDBus.QtTypeName.%1%2\" value=\"%3\"/>\n")
                        .arg(isOutput ? QLatin1String("Out") : QLatin1String("In"))
diff --git a/src/tools/qdbuscpp2xml/qdbuscpp2xml.cpp b/src/tools/qdbuscpp2xml/qdbuscpp2xml.cpp
index a8532f7003..eabfc8e5e3 100644
--- a/src/tools/qdbuscpp2xml/qdbuscpp2xml.cpp
+++ b/src/tools/qdbuscpp2xml/qdbuscpp2xml.cpp
@@ -80,7 +80,7 @@ static const char help[] =
     "  -V             Show the program version and quit.\n"
     "\n";
 
-int qDBusParametersForMethod(const FunctionDef &mm, QList<int> &metaTypes, QString &errorMsg)
+int qDBusParametersForMethod(const FunctionDef &mm, QList<QMetaType> &metaTypes, QString &errorMsg)
 {
     QList<QByteArray> parameterTypes;
     parameterTypes.reserve(mm.arguments.size());
@@ -107,13 +107,13 @@ static QString addFunction(const FunctionDef &mm, bool isSignal = false) {
     int typeId = QMetaType::fromName(mm.normalizedType).id();
     if (typeId != QMetaType::Void) {
         if (typeId) {
-            const char *typeName = QDBusMetaType::typeToSignature(typeId);
+            const char *typeName = QDBusMetaType::typeToSignature(QMetaType(typeId));
             if (typeName) {
                 xml += QString::fromLatin1("      <arg type=\"%1\" direction=\"out\"/>\n")
                         .arg(typeNameToXml(typeName));
 
                     // do we need to describe this argument?
-                    if (QDBusMetaType::signatureToType(typeName) == QMetaType::UnknownType)
+                    if (!QDBusMetaType::signatureToMetaType(typeName).isValid())
                         xml += QString::fromLatin1("      <annotation name=\"org.qtproject.QtDBus.QtTypeName.Out0\" value=\"%1\"/>\n")
                             .arg(typeNameToXml(mm.normalizedType.constData()));
             } else {
@@ -124,7 +124,7 @@ static QString addFunction(const FunctionDef &mm, bool isSignal = false) {
         }
     }
     QList<ArgumentDef> names = mm.arguments;
-    QList<int> types;
+    QList<QMetaType> types;
     QString errorMsg;
     int inputCount = qDBusParametersForMethod(mm, types, errorMsg);
     if (inputCount == -1) {
@@ -150,14 +150,14 @@ static QString addFunction(const FunctionDef &mm, bool isSignal = false) {
 
         bool isOutput = isSignal || j > inputCount;
 
-        const char *signature = QDBusMetaType::typeToSignature(types.at(j));
+        const char *signature = QDBusMetaType::typeToSignature(QMetaType(types.at(j)));
         xml += QString::fromLatin1("      <arg %1type=\"%2\" direction=\"%3\"/>\n")
                 .arg(name,
                      QLatin1String(signature),
                      isOutput ? QLatin1String("out") : QLatin1String("in"));
 
         // do we need to describe this argument?
-        if (QDBusMetaType::signatureToType(signature) == QMetaType::UnknownType) {
+        if (!QDBusMetaType::signatureToMetaType(signature).isValid()) {
             const char *typeName = QMetaType(types.at(j)).name();
             xml += QString::fromLatin1("      <annotation name=\"org.qtproject.QtDBus.QtTypeName.%1%2\" value=\"%3\"/>\n")
                     .arg(isOutput ? QLatin1String("Out") : QLatin1String("In"))
@@ -214,7 +214,7 @@ static QString generateInterfaceXml(const ClassDef *mo)
                         mp.type.constData());
                 continue;
             }
-            const char *signature = QDBusMetaType::typeToSignature(typeId);
+            const char *signature = QDBusMetaType::typeToSignature(QMetaType(typeId));
             if (!signature)
                 continue;
 
@@ -223,7 +223,7 @@ static QString generateInterfaceXml(const ClassDef *mo)
                            QLatin1String(signature),
                            QLatin1String(accessvalues[access]));
 
-            if (QDBusMetaType::signatureToType(signature) == QMetaType::UnknownType) {
+            if (!QDBusMetaType::signatureToMetaType(signature).isValid()) {
                 retval += QString::fromLatin1(">\n      <annotation name=\"org.qtproject.QtDBus.QtTypeName\" value=\"%3\"/>\n    </property>\n")
                           .arg(typeNameToXml(mp.type.constData()));
             } else {
diff --git a/src/tools/qdbusxml2cpp/qdbusxml2cpp.cpp b/src/tools/qdbusxml2cpp/qdbusxml2cpp.cpp
index 96928f4da3..d31c52e188 100644
--- a/src/tools/qdbusxml2cpp/qdbusxml2cpp.cpp
+++ b/src/tools/qdbusxml2cpp/qdbusxml2cpp.cpp
@@ -205,7 +205,7 @@ static QString classNameForInterface(const QString &interface, ClassType classTy
 // we first search for "Out" and if not found we search for "In"
 static QByteArray qtTypeName(const QString &signature, const QDBusIntrospection::Annotations &annotations, int paramId = -1, const char *direction = "Out", bool isSignal = false)
 {
-    int type = QDBusMetaType::signatureToType(signature.toLatin1());
+    int type = QDBusMetaType::signatureToMetaType(signature.toLatin1()).id();
     if (type == QMetaType::UnknownType) {
         QString annotationName = QString::fromLatin1("org.qtproject.QtDBus.QtTypeName");
         if (paramId >= 0)
diff --git a/tests/auto/dbus/qdbusmarshall/common.h b/tests/auto/dbus/qdbusmarshall/common.h
index 6695567a80..3dfe3e39bb 100644
--- a/tests/auto/dbus/qdbusmarshall/common.h
+++ b/tests/auto/dbus/qdbusmarshall/common.h
@@ -386,7 +386,7 @@ inline bool compare(const QDBusArgument &arg, const QVariant &v2, T * = 0)
 
 bool compareToArgument(const QDBusArgument &arg, const QVariant &v2)
 {
-    if (arg.currentSignature() != QDBusMetaType::typeToSignature(v2.userType()))
+    if (arg.currentSignature() != QDBusMetaType::typeToSignature(v2.metaType()))
         return false;
 
     // try to demarshall the arg according to v2
@@ -521,7 +521,7 @@ bool compareToArgument(const QDBusArgument &arg, const QVariant &v2)
     }
 
     qWarning() << "Unexpected QVariant type" << v2.userType()
-               << QByteArray(QDBusMetaType::typeToSignature(v2.userType()))
+               << QByteArray(QDBusMetaType::typeToSignature(v2.metaType()))
                << v2.metaType().name();
     return false;
 }
diff --git a/tests/auto/dbus/qdbusmetatype/tst_qdbusmetatype.cpp b/tests/auto/dbus/qdbusmetatype/tst_qdbusmetatype.cpp
index 18503483ed..2217f112f8 100644
--- a/tests/auto/dbus/qdbusmetatype/tst_qdbusmetatype.cpp
+++ b/tests/auto/dbus/qdbusmetatype/tst_qdbusmetatype.cpp
@@ -354,7 +354,7 @@ void tst_QDBusMetaType::staticTypes()
 {
     QFETCH(QVariant::Type, typeId);
 
-    QString result = QDBusMetaType::typeToSignature(typeId);
+    QString result = QDBusMetaType::typeToSignature(QMetaType(typeId));
     QTEST(result, "signature");
 }
 
diff --git a/tests/auto/tools/qmakelib/tst_qmakelib.cpp b/tests/auto/tools/qmakelib/tst_qmakelib.cpp
index a699a0575e..d1830e2c17 100644
--- a/tests/auto/tools/qmakelib/tst_qmakelib.cpp
+++ b/tests/auto/tools/qmakelib/tst_qmakelib.cpp
@@ -81,6 +81,7 @@ void tst_qmakelib::proString()
 
     ProString s3("this is a longish string with bells and whistles");
     s3 = s3.mid(18, 17);
+    QCOMPARE(s3.toQString(), QStringLiteral("string with bells"));
     // Prepend to detached string with lots of spare space in it.
     s3.prepend(ProString("another "));
     QCOMPARE(s3.toQString(), QStringLiteral("another string with bells"));