diff --git a/src/widgets/kernel/qwidget_qpa.cpp b/src/widgets/kernel/qwidget_qpa.cpp
index 93234f39584..3b6127e4e71 100644
--- a/src/widgets/kernel/qwidget_qpa.cpp
+++ b/src/widgets/kernel/qwidget_qpa.cpp
@@ -148,10 +148,12 @@ void QWidgetPrivate::create_sys(WId window, bool initializeWindow, bool destroyO
     QBackingStore *store = q->backingStore();
 
     if (!store) {
-        if (win && q->windowType() != Qt::Desktop)
-            q->setBackingStore(new QBackingStore(win));
-        else
+        if (win && q->windowType() != Qt::Desktop) {
+            if (q->isTopLevel())
+                q->setBackingStore(new QBackingStore(win));
+        } else {
             q->setAttribute(Qt::WA_PaintOnScreen, true);
+        }
     }
 
     setWindowModified_helper();