diff --git a/src/widgets/kernel/qwidget.cpp b/src/widgets/kernel/qwidget.cpp
index d792b48467d..113c5695912 100644
--- a/src/widgets/kernel/qwidget.cpp
+++ b/src/widgets/kernel/qwidget.cpp
@@ -860,22 +860,6 @@ QWidgetMapper *QWidgetPrivate::mapper = 0;          // widget with wid
 QWidgetSet *QWidgetPrivate::allWidgets = 0;         // widgets with no wid
 
 
-/*****************************************************************************
-  QWidget utility functions
- *****************************************************************************/
-
-QRegion qt_dirtyRegion(QWidget *widget)
-{
-    if (!widget)
-        return QRegion();
-
-    QWidgetRepaintManager *repaintManager = qt_widget_private(widget)->maybeRepaintManager();
-    if (!repaintManager)
-        return QRegion();
-
-    return repaintManager->dirtyRegion(widget);
-}
-
 /*****************************************************************************
   QWidget member functions
  *****************************************************************************/
diff --git a/src/widgets/kernel/qwidgetrepaintmanager.cpp b/src/widgets/kernel/qwidgetrepaintmanager.cpp
index cbad1d3f04c..1a967aa6efc 100644
--- a/src/widgets/kernel/qwidgetrepaintmanager.cpp
+++ b/src/widgets/kernel/qwidgetrepaintmanager.cpp
@@ -72,8 +72,6 @@
 
 QT_BEGIN_NAMESPACE
 
-extern QRegion qt_dirtyRegion(QWidget *);
-
 #ifndef QT_NO_OPENGL
 Q_GLOBAL_STATIC(QPlatformTextureList, qt_dummy_platformTextureList)
 #endif
diff --git a/src/widgets/kernel/qwidgetrepaintmanager_p.h b/src/widgets/kernel/qwidgetrepaintmanager_p.h
index 933142a3074..34da752feb1 100644
--- a/src/widgets/kernel/qwidgetrepaintmanager_p.h
+++ b/src/widgets/kernel/qwidgetrepaintmanager_p.h
@@ -266,7 +266,6 @@ private:
 #endif
     }
 
-    friend QRegion qt_dirtyRegion(QWidget *);
     friend class QWidgetPrivate;
     friend class QWidget;
     friend class QBackingStore;