diff --git a/src/gui/kernel/qplatformdialoghelper.h b/src/gui/kernel/qplatformdialoghelper.h
index ece24f8078..010957cf21 100644
--- a/src/gui/kernel/qplatformdialoghelper.h
+++ b/src/gui/kernel/qplatformdialoghelper.h
@@ -91,9 +91,6 @@ public:
     virtual QVariant styleHint(StyleHint hint) const;
 
     virtual void exec() = 0;
-
-    virtual void deleteNativeDialog() = 0;
-
     virtual bool show(Qt::WindowFlags windowFlags,
                           Qt::WindowModality windowModality,
                           QWindow *parent) = 0;
diff --git a/src/plugins/platforms/cocoa/qcocoacolordialoghelper.h b/src/plugins/platforms/cocoa/qcocoacolordialoghelper.h
index 263ccdc086..aaa2e26fc4 100644
--- a/src/plugins/platforms/cocoa/qcocoacolordialoghelper.h
+++ b/src/plugins/platforms/cocoa/qcocoacolordialoghelper.h
@@ -54,7 +54,6 @@ public:
     virtual ~QCocoaColorDialogHelper();
 
     void exec();
-    void deleteNativeDialog();
     bool show(Qt::WindowFlags windowFlags, Qt::WindowModality windowModality, QWindow *parent);
     void hide();
 
diff --git a/src/plugins/platforms/cocoa/qcocoacolordialoghelper.mm b/src/plugins/platforms/cocoa/qcocoacolordialoghelper.mm
index 7d245c3db6..d617d1d210 100644
--- a/src/plugins/platforms/cocoa/qcocoacolordialoghelper.mm
+++ b/src/plugins/platforms/cocoa/qcocoacolordialoghelper.mm
@@ -343,7 +343,12 @@ QCocoaColorDialogHelper::QCocoaColorDialogHelper() :
 }
 
 QCocoaColorDialogHelper::~QCocoaColorDialogHelper()
-{ }
+{
+    if (!mDelegate)
+        return;
+    [reinterpret_cast<QT_MANGLE_NAMESPACE(QNSColorPanelDelegate) *>(mDelegate) release];
+    mDelegate = 0;
+}
 
 void QCocoaColorDialogHelper::exec()
 {
@@ -358,14 +363,6 @@ void QCocoaColorDialogHelper::exec()
         emit reject();
 }
 
-void QCocoaColorDialogHelper::deleteNativeDialog()
-{
-    if (!mDelegate)
-        return;
-    [reinterpret_cast<QT_MANGLE_NAMESPACE(QNSColorPanelDelegate) *>(mDelegate) release];
-    mDelegate = 0;
-}
-
 bool QCocoaColorDialogHelper::show(Qt::WindowFlags, Qt::WindowModality windowModality, QWindow *parent)
 {
     if (windowModality == Qt::WindowModal) {
diff --git a/src/plugins/platforms/cocoa/qcocoafiledialoghelper.h b/src/plugins/platforms/cocoa/qcocoafiledialoghelper.h
index 76c4b87e11..9bdf3acd71 100644
--- a/src/plugins/platforms/cocoa/qcocoafiledialoghelper.h
+++ b/src/plugins/platforms/cocoa/qcocoafiledialoghelper.h
@@ -60,7 +60,6 @@ public:
 
     bool defaultNameFilterDisables() const;
 
-    void deleteNativeDialog();
     bool show(Qt::WindowFlags windowFlags, Qt::WindowModality windowModality, QWindow *parent);
     void hide();
     void setDirectory(const QString &directory);
diff --git a/src/plugins/platforms/cocoa/qcocoafiledialoghelper.mm b/src/plugins/platforms/cocoa/qcocoafiledialoghelper.mm
index ccf9482e4f..30f4cabfae 100644
--- a/src/plugins/platforms/cocoa/qcocoafiledialoghelper.mm
+++ b/src/plugins/platforms/cocoa/qcocoafiledialoghelper.mm
@@ -511,7 +511,10 @@ QCocoaFileDialogHelper::QCocoaFileDialogHelper()
 
 QCocoaFileDialogHelper::~QCocoaFileDialogHelper()
 {
-
+    if (!mDelegate)
+        return;
+    [reinterpret_cast<QT_MANGLE_NAMESPACE(QNSOpenSavePanelDelegate) *>(mDelegate) release];
+    mDelegate = 0;
 }
 
 void QCocoaFileDialogHelper::QNSOpenSavePanelDelegate_selectionChanged(const QString &newPath)
@@ -602,12 +605,6 @@ QString QCocoaFileDialogHelper::selectedNameFilter() const
     return index != -1 ? options()->nameFilters().at(index) : QString();
 }
 
-void QCocoaFileDialogHelper::deleteNativeDialog()
-{
-    [reinterpret_cast<QT_MANGLE_NAMESPACE(QNSOpenSavePanelDelegate) *>(mDelegate) release];
-    mDelegate = 0;
-}
-
 void QCocoaFileDialogHelper::hide()
 {
     hideCocoaFilePanel();
diff --git a/src/plugins/platforms/cocoa/qcocoafontdialoghelper.h b/src/plugins/platforms/cocoa/qcocoafontdialoghelper.h
index 2e185b769a..8c041205a5 100644
--- a/src/plugins/platforms/cocoa/qcocoafontdialoghelper.h
+++ b/src/plugins/platforms/cocoa/qcocoafontdialoghelper.h
@@ -54,12 +54,10 @@ class QCocoaFontDialogHelper : public QPlatformFontDialogHelper
 {
 public:
     QCocoaFontDialogHelper();
-    virtual ~QCocoaFontDialogHelper();
+    ~QCocoaFontDialogHelper();
 
     void exec();
 
-    void deleteNativeDialog();
-
     bool show(Qt::WindowFlags windowFlags, Qt::WindowModality windowModality, QWindow *parent);
     void hide();
 
diff --git a/src/plugins/platforms/cocoa/qcocoafontdialoghelper.mm b/src/plugins/platforms/cocoa/qcocoafontdialoghelper.mm
index a70953d0df..088f6265ca 100644
--- a/src/plugins/platforms/cocoa/qcocoafontdialoghelper.mm
+++ b/src/plugins/platforms/cocoa/qcocoafontdialoghelper.mm
@@ -362,7 +362,12 @@ QCocoaFontDialogHelper::QCocoaFontDialogHelper() :
 }
 
 QCocoaFontDialogHelper::~QCocoaFontDialogHelper()
-{ }
+{
+    if (!mDelegate)
+        return;
+    [reinterpret_cast<QT_MANGLE_NAMESPACE(QNSFontPanelDelegate) *>(mDelegate) release];
+    mDelegate = 0;
+}
 
 void QCocoaFontDialogHelper::exec()
 {
@@ -377,14 +382,6 @@ void QCocoaFontDialogHelper::exec()
         emit reject();
 }
 
-void QCocoaFontDialogHelper::deleteNativeDialog()
-{
-    if (!mDelegate)
-        return;
-    [reinterpret_cast<QT_MANGLE_NAMESPACE(QNSFontPanelDelegate) *>(mDelegate) release];
-    mDelegate = 0;
-}
-
 bool QCocoaFontDialogHelper::show(Qt::WindowFlags, Qt::WindowModality windowModality, QWindow *parent)
 {
     if (windowModality == Qt::WindowModal) {
diff --git a/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp b/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp
index e1aae23b8c..e283848236 100644
--- a/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp
+++ b/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp
@@ -425,6 +425,12 @@ QWindowsDialogHelperBase<BaseClass>::QWindowsDialogHelperBase() :
 {
 }
 
+template <class BaseClass>
+QWindowsDialogHelperBase<BaseClass>::~QWindowsDialogHelperBase()
+{
+    delete m_nativeDialog;
+}
+
 template <class BaseClass>
 QWindowsNativeDialogBase *QWindowsDialogHelperBase<BaseClass>::nativeDialog() const
 {
@@ -444,15 +450,6 @@ QWindowsNativeDialogBase *QWindowsDialogHelperBase<BaseClass>::ensureNativeDialo
     return m_nativeDialog;
 }
 
-template <class BaseClass>
-void QWindowsDialogHelperBase<BaseClass>::deleteNativeDialog()
-{
-    if (QWindowsContext::verboseDialogs)
-        qDebug("%s" , __FUNCTION__);
-    delete m_nativeDialog;
-    m_nativeDialog = 0;
-}
-
 /*!
     \class QWindowsDialogThread
     \brief Run a non-modal native dialog in a separate thread.
diff --git a/src/plugins/platforms/windows/qwindowsdialoghelpers.h b/src/plugins/platforms/windows/qwindowsdialoghelpers.h
index a8e0de0383..b3c83f6501 100644
--- a/src/plugins/platforms/windows/qwindowsdialoghelpers.h
+++ b/src/plugins/platforms/windows/qwindowsdialoghelpers.h
@@ -67,7 +67,6 @@ class QWindowsDialogHelperBase : public BaseClass
 public:
 
     virtual void exec();
-    virtual void deleteNativeDialog();
     virtual bool show(Qt::WindowFlags windowFlags,
                           Qt::WindowModality windowModality,
                           QWindow *parent);
@@ -78,6 +77,7 @@ public:
 
 protected:
     QWindowsDialogHelperBase();
+    ~QWindowsDialogHelperBase();
     QWindowsNativeDialogBase *nativeDialog() const;
 
 private:
diff --git a/src/widgets/dialogs/qdialog.cpp b/src/widgets/dialogs/qdialog.cpp
index b0cc35340d..f3e0773eac 100644
--- a/src/widgets/dialogs/qdialog.cpp
+++ b/src/widgets/dialogs/qdialog.cpp
@@ -123,12 +123,12 @@ QVariant QDialogPrivate::styleHint(QPlatformDialogHelper::StyleHint hint) const
     return QPlatformDialogHelper::defaultStyleHint(hint);
 }
 
-void QDialogPrivate::deleteNativeDialog()
+void QDialogPrivate::deletePlatformHelper()
 {
-    if (QPlatformDialogHelper *helper = platformHelper()) {
-        helper->deleteNativeDialog();
-        nativeDialogInUse = false;
-    }
+    delete m_platformHelper;
+    m_platformHelper = 0;
+    m_platformHelperCreated = false;
+    nativeDialogInUse = false;
 }
 
 /*!
@@ -335,7 +335,6 @@ QDialog::~QDialog()
     } QT_CATCH(...) {
         // we're in the destructor - just swallow the exception
     }
-    d->deleteNativeDialog();
 }
 
 /*!
diff --git a/src/widgets/dialogs/qdialog_p.h b/src/widgets/dialogs/qdialog_p.h
index 3b8a5edb0f..34d5c551fd 100644
--- a/src/widgets/dialogs/qdialog_p.h
+++ b/src/widgets/dialogs/qdialog_p.h
@@ -83,7 +83,7 @@ public:
     QWindow *parentWindow() const;
     bool setNativeDialogVisible(bool visible);
     QVariant styleHint(QPlatformDialogHelper::StyleHint hint) const;
-    void deleteNativeDialog();
+    void deletePlatformHelper();
 
     QPointer<QPushButton> mainDef;
     Qt::Orientation orientation;
diff --git a/src/widgets/dialogs/qfiledialog.cpp b/src/widgets/dialogs/qfiledialog.cpp
index 15a85c98d9..057728e254 100644
--- a/src/widgets/dialogs/qfiledialog.cpp
+++ b/src/widgets/dialogs/qfiledialog.cpp
@@ -1371,7 +1371,7 @@ void QFileDialog::setAcceptMode(QFileDialog::AcceptMode mode)
     }
     d->retranslateWindowTitle();
     // we need to recreate the native dialog when changing the AcceptMode
-    d->deleteNativeDialog();
+    d->deletePlatformHelper();
     // clear WA_DontShowOnScreen so that d->canBeNativeDialog() doesn't return false incorrectly
     setAttribute(Qt::WA_DontShowOnScreen, false);
 }