diff --git a/src/compositor/compositor.c b/src/compositor/compositor.c
index 54fcd4482..075d4ac65 100644
--- a/src/compositor/compositor.c
+++ b/src/compositor/compositor.c
@@ -517,7 +517,7 @@ meta_compositor_manage (MetaCompositor *compositor)
   MetaDisplay *display = compositor->display;
   Display *xdisplay = display->xdisplay;
   MetaScreen *screen = display->screen;
-  Window xwin;
+  Window xwin = 0;
   gint width, height;
   MetaWaylandCompositor *wayland_compositor;