diff --git a/gdk/x11/gdkwindow-x11.c b/gdk/x11/gdkwindow-x11.c
index fd1ea5d047..e18f1d04c0 100644
--- a/gdk/x11/gdkwindow-x11.c
+++ b/gdk/x11/gdkwindow-x11.c
@@ -3278,8 +3278,6 @@ gdk_window_x11_get_device_state (GdkWindow       *window,
 {
   GdkWindow *child;
 
-  g_return_val_if_fail (window == NULL || GDK_IS_WINDOW (window), FALSE);
-
   if (GDK_WINDOW_DESTROYED (window))
     return FALSE;