diff --git a/src/meta/compositor-mutter.h b/src/meta/compositor-mutter.h
index e196c65..ac72646 100644
--- a/src/meta/compositor-mutter.h
+++ b/src/meta/compositor-mutter.h
@@ -39,6 +39,7 @@
 Window        meta_get_overlay_window           (MetaScreen *screen);
 GList        *meta_get_window_actors            (MetaScreen *screen);
 ClutterActor *meta_get_window_group_for_screen  (MetaScreen *screen);
+ClutterActor *meta_get_top_window_group_for_screen  (MetaScreen *screen);
 
 void        meta_disable_unredirect_for_screen  (MetaScreen *screen);
 void        meta_enable_unredirect_for_screen   (MetaScreen *screen);