diff --git a/layout/xul/base/src/nsMenuPopupFrame.cpp b/layout/xul/base/src/nsMenuPopupFrame.cpp
index 40da52e0c8a8..3bdff88cdf71 100644
--- a/layout/xul/base/src/nsMenuPopupFrame.cpp
+++ b/layout/xul/base/src/nsMenuPopupFrame.cpp
@@ -1250,7 +1250,7 @@ nsMenuPopupFrame::SyncViewWithFrame(nsIPresContext* aPresContext,
 
     // ensure it is not even partially offscreen.
     if ( (screenViewLocX + mRect.width) > screenRightTwips )
-        xpos -= (screenViewLocX + mRect.width) - screenRightTwips;
+      xpos -= (screenViewLocX + mRect.width) - screenRightTwips;
     if ( (screenViewLocY + mRect.height) > screenBottomTwips )
       ypos -= (mRect.height + margin.top + margin.bottom);