diff --git a/src/widgets/widgets/qtabbar.cpp b/src/widgets/widgets/qtabbar.cpp
index e8e70dc61e..982bdad7a8 100644
--- a/src/widgets/widgets/qtabbar.cpp
+++ b/src/widgets/widgets/qtabbar.cpp
@@ -366,12 +366,14 @@ void QTabBarPrivate::init()
     leftB = new QToolButton(q);
     leftB->setObjectName(u"ScrollLeftButton"_s);
     leftB->setAutoRepeat(true);
-    QObject::connect(leftB, SIGNAL(clicked()), q, SLOT(_q_scrollTabs()));
+    QObjectPrivate::connect(leftB, &QToolButton::clicked,
+                            this, &QTabBarPrivate::scrollTabs);
     leftB->hide();
     rightB = new QToolButton(q);
     rightB->setObjectName(u"ScrollRightButton"_s);
     rightB->setAutoRepeat(true);
-    QObject::connect(rightB, SIGNAL(clicked()), q, SLOT(_q_scrollTabs()));
+    QObjectPrivate::connect(rightB, &QToolButton::clicked,
+                            this, &QTabBarPrivate::scrollTabs);
     rightB->hide();
 #ifdef QT_KEYPAD_NAVIGATION
     if (QApplicationPrivate::keypadNavigationEnabled()) {
@@ -765,7 +767,7 @@ void QTabBarPrivate::autoHideTabs()
         q->setVisible(q->count() > 1);
 }
 
-void QTabBarPrivate::_q_closeTab()
+void QTabBarPrivate::closeTab()
 {
     Q_Q(QTabBar);
     QObject *object = q->sender();
@@ -788,7 +790,7 @@ void QTabBarPrivate::_q_closeTab()
         emit q->tabCloseRequested(tabToClose);
 }
 
-void QTabBarPrivate::_q_scrollTabs()
+void QTabBarPrivate::scrollTabs()
 {
     Q_Q(QTabBar);
     const QObject *sender = q->sender();
@@ -973,7 +975,8 @@ int QTabBar::insertTab(int index, const QIcon& icon, const QString &text)
         initStyleOption(&opt, index);
         ButtonPosition closeSide = (ButtonPosition)style()->styleHint(QStyle::SH_TabBar_CloseButtonPosition, nullptr, this);
         QAbstractButton *closeButton = new CloseButton(this);
-        connect(closeButton, SIGNAL(clicked()), this, SLOT(_q_closeTab()));
+        QObjectPrivate::connect(closeButton, &CloseButton::clicked,
+                                d, &QTabBarPrivate::closeTab);
         setTabButton(index, closeSide, closeButton);
     }
 
@@ -2577,7 +2580,8 @@ void QTabBar::setTabsClosable(bool closable)
                 continue;
             newButtons = true;
             QAbstractButton *closeButton = new CloseButton(this);
-            connect(closeButton, SIGNAL(clicked()), this, SLOT(_q_closeTab()));
+            QObjectPrivate::connect(closeButton, &CloseButton::clicked,
+                                    d, &QTabBarPrivate::closeTab);
             setTabButton(i, closeSide, closeButton);
         }
         if (newButtons)
diff --git a/src/widgets/widgets/qtabbar.h b/src/widgets/widgets/qtabbar.h
index 2d3179e2d0..2759d5a318 100644
--- a/src/widgets/widgets/qtabbar.h
+++ b/src/widgets/widgets/qtabbar.h
@@ -185,8 +185,6 @@ protected:
 private:
     Q_DISABLE_COPY(QTabBar)
     Q_DECLARE_PRIVATE(QTabBar)
-    Q_PRIVATE_SLOT(d_func(), void _q_scrollTabs())
-    Q_PRIVATE_SLOT(d_func(), void _q_closeTab())
 };
 
 QT_END_NAMESPACE
diff --git a/src/widgets/widgets/qtabbar_p.h b/src/widgets/widgets/qtabbar_p.h
index 831d3acd3c..d76f439bd7 100644
--- a/src/widgets/widgets/qtabbar_p.h
+++ b/src/widgets/widgets/qtabbar_p.h
@@ -187,8 +187,8 @@ public:
     inline bool validIndex(int index) const { return index >= 0 && index < tabList.size(); }
     void setCurrentNextEnabledIndex(int offset);
 
-    void _q_scrollTabs();
-    void _q_closeTab();
+    void scrollTabs();
+    void closeTab();
     void moveTab(int index, int offset);
     void moveTabFinished(int index);
 
diff --git a/src/widgets/widgets/qtabwidget.cpp b/src/widgets/widgets/qtabwidget.cpp
index c524e8d4c7..5e7c266ef6 100644
--- a/src/widgets/widgets/qtabwidget.cpp
+++ b/src/widgets/widgets/qtabwidget.cpp
@@ -156,9 +156,9 @@ public:
     QTabWidgetPrivate();
     ~QTabWidgetPrivate();
     void updateTabBarPosition();
-    void _q_showTab(int);
-    void _q_removeTab(int);
-    void _q_tabMoved(int from, int to);
+    void showTab(int);
+    void removeTab(int);
+    void tabMoved(int from, int to);
     void init();
     bool isAutoHidden() const
     {
@@ -197,7 +197,7 @@ void QTabWidgetPrivate::init()
     // hack so that QMacStyle::layoutSpacing() can detect tab widget pages
     stack->setSizePolicy(QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred, QSizePolicy::TabWidget));
 
-    QObject::connect(stack, SIGNAL(widgetRemoved(int)), q, SLOT(_q_removeTab(int)));
+    QObjectPrivate::connect(stack, &QStackedWidget::widgetRemoved, this, &QTabWidgetPrivate::removeTab);
     QTabBar *tabBar = new QTabBar(q);
     tabBar->setObjectName("qt_tabwidget_tabbar"_L1);
     tabBar->setDrawBase(false);
@@ -720,17 +720,17 @@ void QTabWidget::setTabBar(QTabBar* tb)
     delete d->tabs;
     d->tabs = tb;
     setFocusProxy(d->tabs);
-    connect(d->tabs, SIGNAL(currentChanged(int)),
-            this, SLOT(_q_showTab(int)));
-    connect(d->tabs, SIGNAL(tabMoved(int,int)),
-            this, SLOT(_q_tabMoved(int,int)));
-    connect(d->tabs, SIGNAL(tabBarClicked(int)),
-            this, SIGNAL(tabBarClicked(int)));
-    connect(d->tabs, SIGNAL(tabBarDoubleClicked(int)),
-            this, SIGNAL(tabBarDoubleClicked(int)));
+    QObjectPrivate::connect(d->tabs, &QTabBar::currentChanged,
+                            d, &QTabWidgetPrivate::showTab);
+    QObjectPrivate::connect(d->tabs, &QTabBar::tabMoved,
+                            d, &QTabWidgetPrivate::tabMoved);
+    connect(d->tabs, &QTabBar::tabBarClicked,
+            this, &QTabWidget::tabBarClicked);
+    connect(d->tabs, &QTabBar::tabBarDoubleClicked,
+            this, &QTabWidget::tabBarDoubleClicked);
     if (d->tabs->tabsClosable())
-        connect(d->tabs, SIGNAL(tabCloseRequested(int)),
-                this, SIGNAL(tabCloseRequested(int)));
+        connect(d->tabs, &QTabBar::tabCloseRequested,
+                this, &QTabWidget::tabCloseRequested);
     tb->setExpanding(!documentMode());
     setUpLayout();
 }
@@ -752,7 +752,7 @@ QTabBar* QTabWidget::tabBar() const
     sized.
 */
 
-void QTabWidgetPrivate::_q_showTab(int index)
+void QTabWidgetPrivate::showTab(int index)
 {
     Q_Q(QTabWidget);
     if (index < stack->count() && index >= 0)
@@ -760,7 +760,7 @@ void QTabWidgetPrivate::_q_showTab(int index)
     emit q->currentChanged(index);
 }
 
-void QTabWidgetPrivate::_q_removeTab(int index)
+void QTabWidgetPrivate::removeTab(int index)
 {
     Q_Q(QTabWidget);
     tabs->removeTab(index);
@@ -768,7 +768,7 @@ void QTabWidgetPrivate::_q_removeTab(int index)
     q->tabRemoved(index);
 }
 
-void QTabWidgetPrivate::_q_tabMoved(int from, int to)
+void QTabWidgetPrivate::tabMoved(int from, int to)
 {
     const QSignalBlocker blocker(stack);
     QWidget *w = stack->widget(from);
diff --git a/src/widgets/widgets/qtabwidget.h b/src/widgets/widgets/qtabwidget.h
index 6188ea4999..c813f8d921 100644
--- a/src/widgets/widgets/qtabwidget.h
+++ b/src/widgets/widgets/qtabwidget.h
@@ -141,9 +141,6 @@ protected:
 private:
     Q_DECLARE_PRIVATE(QTabWidget)
     Q_DISABLE_COPY(QTabWidget)
-    Q_PRIVATE_SLOT(d_func(), void _q_showTab(int))
-    Q_PRIVATE_SLOT(d_func(), void _q_removeTab(int))
-    Q_PRIVATE_SLOT(d_func(), void _q_tabMoved(int, int))
     void setUpLayout(bool = false);
 };