diff --git a/mozilla/view/src/nsScrollPortView.cpp b/mozilla/view/src/nsScrollPortView.cpp
index 849425ec401..b6d0dbb4d41 100644
--- a/mozilla/view/src/nsScrollPortView.cpp
+++ b/mozilla/view/src/nsScrollPortView.cpp
@@ -468,7 +468,7 @@ NS_IMETHODIMP nsScrollPortView::ScrollByWhole(PRBool aTop)
     newPos = scrolledSize.height;
   }
 
-  ScrollTo(0, newPos, 0);
+  ScrollTo(mOffsetX, newPos, 0);
 
   return NS_OK;
 }