diff --git a/Source/x11/XGServerWindow.m b/Source/x11/XGServerWindow.m
index 5423c79..2e3eabf 100644
--- a/Source/x11/XGServerWindow.m
+++ b/Source/x11/XGServerWindow.m
@@ -2292,7 +2292,7 @@ _get_next_prop_new_event(Display *display, XEvent *event, char *arg)
     XDestroyRegion (window->region);
   RELEASE(window->exposedRects);
   NSMapRemove(windowtags, (void*)(uintptr_t)win);
-  free(window);
+  NSZoneFree(0, window);
 }
 
 /*