diff --git a/src/compositor/meta-window-actor.c b/src/compositor/meta-window-actor.c
index 70ec535b2..f74b8c677 100644
--- a/src/compositor/meta-window-actor.c
+++ b/src/compositor/meta-window-actor.c
@@ -2175,6 +2175,7 @@ build_and_scan_frame_mask (MetaWindowActor       *self,
       scanned_region = scan_visible_region (mask_data, stride, frame_paint_region);
       cairo_region_union (shape_region, scanned_region);
       cairo_region_destroy (scanned_region);
+      cairo_region_destroy (frame_paint_region);
     }
 
   cairo_destroy (cr);