diff --git a/src/core/window.c b/src/core/window.c
index 9b49cfbab..002e4c5f0 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -234,6 +234,9 @@ meta_window_finalize (GObject *object)
   if (window->frame_bounds)
     cairo_region_destroy (window->frame_bounds);
 
+  if (window->shape_region)
+    cairo_region_destroy (window->shape_region);
+
   if (window->opaque_region)
     cairo_region_destroy (window->opaque_region);