diff --git a/layout/xul/base/src/nsMenuFrame.cpp b/layout/xul/base/src/nsMenuFrame.cpp
index dee022ad462..6340029f596 100644
--- a/layout/xul/base/src/nsMenuFrame.cpp
+++ b/layout/xul/base/src/nsMenuFrame.cpp
@@ -343,6 +343,7 @@ nsMenuFrame::Destroy(nsPresContext* aPresContext)
     }
   }
 
+  UngenerateMenu();
   DestroyPopupFrames(aPresContext);
   return nsBoxFrame::Destroy(aPresContext);
 }