diff --git a/src/widgets/kernel/qwidgetbackingstore.cpp b/src/widgets/kernel/qwidgetbackingstore.cpp
index d1070839fa..fff75d829f 100644
--- a/src/widgets/kernel/qwidgetbackingstore.cpp
+++ b/src/widgets/kernel/qwidgetbackingstore.cpp
@@ -763,9 +763,8 @@ QWidgetBackingStore::~QWidgetBackingStore()
 
 #ifndef QT_NO_OPENGL
     delete widgetTextures;
-    delete dirtyOnScreenWidgets;
 #endif
-    dirtyOnScreenWidgets = 0;
+    delete dirtyOnScreenWidgets;
 }
 
 //parent's coordinates; move whole rect; update parent and widget
diff --git a/src/widgets/kernel/qwidgetbackingstore_p.h b/src/widgets/kernel/qwidgetbackingstore_p.h
index bcffa3be79..b7ee7e4168 100644
--- a/src/widgets/kernel/qwidgetbackingstore_p.h
+++ b/src/widgets/kernel/qwidgetbackingstore_p.h
@@ -301,6 +301,8 @@ private:
     friend class QWidgetPrivate;
     friend class QWidget;
     friend class QBackingStore;
+
+    Q_DISABLE_COPY(QWidgetBackingStore)
 };
 
 QT_END_NAMESPACE