--- mutter-3.14.2/src/core/window.c.orig	2014-12-28 12:45:03.578000000 +0100
+++ mutter-3.14.2/src/core/window.c	2014-12-28 12:45:32.097000000 +0100
@@ -3481,7 +3481,7 @@
 
 static MetaMonitorInfo *
 find_monitor_by_winsys_id (MetaWindow *window,
-                           guint       winsys_id)
+                           gint       winsys_id)
 {
   int i;
 
@@ -3602,7 +3602,7 @@
    */
 
   gboolean did_placement;
-  guint old_output_winsys_id;
+  gint old_output_winsys_id;
   MetaRectangle unconstrained_rect;
   MetaRectangle constrained_rect;
   MetaMoveResizeResultFlags result = 0;