diff --git a/layout/painting/RetainedDisplayListBuilder.h b/layout/painting/RetainedDisplayListBuilder.h
index e255c4d3aa99..b94e96efb327 100644
--- a/layout/painting/RetainedDisplayListBuilder.h
+++ b/layout/painting/RetainedDisplayListBuilder.h
@@ -60,10 +60,6 @@ struct RetainedDisplayListData {
     return GetFlags(aFrame).contains(FrameFlag::HasProps);
   }
 
-  bool HadWillChange(nsIFrame* aFrame) const {
-    return GetFlags(aFrame).contains(FrameFlag::HadWillChange);
-  }
-
   /**
    * Returns an iterator to the underlying frame storage.
    */