diff --git a/scene_opengl.cpp b/scene_opengl.cpp
index ab4d604c37..86948c2819 100644
--- a/scene_opengl.cpp
+++ b/scene_opengl.cpp
@@ -701,6 +701,7 @@ void SceneOpenGL::windowAdded( Toplevel* c )
     {
     assert( !windows.contains( c ));
     windows[ c ] = new Window( c );
+    c->effectWindow()->setSceneWindow( windows[ c ]);
     }
 
 void SceneOpenGL::windowClosed( Toplevel* c, Deleted* deleted )
diff --git a/scene_xrender.cpp b/scene_xrender.cpp
index 3d94dc309f..0b37b85cb9 100644
--- a/scene_xrender.cpp
+++ b/scene_xrender.cpp
@@ -316,6 +316,7 @@ void SceneXrender::windowAdded( Toplevel* c )
     {
     assert( !windows.contains( c ));
     windows[ c ] = new Window( c );
+    c->effectWindow()->setSceneWindow( windows[ c ]);
     }
 
 // Convert QRegion to XserverRegion. This code uses XserverRegion