diff --git a/mozilla/widget/src/mac/nsMacEventHandler.cpp b/mozilla/widget/src/mac/nsMacEventHandler.cpp
index 9f055585a3e..e8c1817523e 100644
--- a/mozilla/widget/src/mac/nsMacEventHandler.cpp
+++ b/mozilla/widget/src/mac/nsMacEventHandler.cpp
@@ -1391,6 +1391,13 @@ nsMacEventHandler::Scroll(EventMouseWheelAxis inAxis, PRInt32 inDelta,
   if (!widgetToScroll)
     return PR_FALSE;
 
+  if (gRollupListener && gRollupWidget && gRollupWidget != widgetToScroll) {
+    PRBool rollup = PR_FALSE;
+    gRollupListener->ShouldRollupOnMouseWheelEvent(&rollup);
+    if (rollup)
+      gRollupListener->Rollup();
+  }
+
   nsMouseScrollEvent scrollEvent(PR_TRUE, NS_MOUSE_SCROLL, widgetToScroll);
 
   // The direction we get from the carbon event is opposite from the way