diff --git a/src/gui/kernel/qplatformwindow.h b/src/gui/kernel/qplatformwindow.h
index 6e2d823c4ad..517dd1ea421 100644
--- a/src/gui/kernel/qplatformwindow.h
+++ b/src/gui/kernel/qplatformwindow.h
@@ -118,6 +118,7 @@ public:
     virtual void requestUpdate();
     bool hasPendingUpdateRequest() const;
     virtual void deliverUpdateRequest();
+#define QT_PLATFORM_WINDOW_HAS_VIRTUAL_SET_BACKING_STORE // remove when all modules have migrated
     virtual void setBackingStore(QPlatformBackingStore *) {}
 
     // Window property accessors. Platform plugins should use these