diff --git a/src/frames/meta-window-tracker.c b/src/frames/meta-window-tracker.c
index 56be33790..39de518f6 100644
--- a/src/frames/meta-window-tracker.c
+++ b/src/frames/meta-window-tracker.c
@@ -340,7 +340,8 @@ meta_window_tracker_constructed (GObject *object)
 
   XSelectInput (xdisplay, xroot,
                 KeyPressMask |
-                PropertyChangeMask);
+                PropertyChangeMask |
+                SubstructureNotifyMask);
 
   g_signal_connect (display, "xevent",
                     G_CALLBACK (on_xevent), object);