diff --git a/server/window.c b/server/window.c
index 8cf8001..201f804 100644
--- a/server/window.c
+++ b/server/window.c
@@ -424,6 +424,7 @@
 static struct window *create_window( struct window *parent, struct window *owner,
                                      atom_t atom, void *instance )
 {
+    static const rectangle_t empty_rect;
     int extra_bytes;
     struct window *win;
     struct desktop *desktop;
@@ -462,6 +463,7 @@
     win->prop_alloc     = 0;
     win->properties     = NULL;
     win->nb_extra_bytes = extra_bytes;
+    win->window_rect = win->visible_rect = win->client_rect = empty_rect;
     memset( win->extra_bytes, 0, extra_bytes );
     list_init( &win->children );
     list_init( &win->unlinked );