diff --git a/mozilla/xpfe/appshell/src/nsWebShellWindow.cpp b/mozilla/xpfe/appshell/src/nsWebShellWindow.cpp
index c0f2f7108ba..37c0a4f474a 100644
--- a/mozilla/xpfe/appshell/src/nsWebShellWindow.cpp
+++ b/mozilla/xpfe/appshell/src/nsWebShellWindow.cpp
@@ -1038,7 +1038,7 @@ nsWebShellWindow::CreatePopup(nsIDOMElement* aElement, nsIDOMElement* aPopupCont
       }
       else if (anAnchorAlignment == "bottomleft") {
         aXPos = rect.x + aXPos;
-        aYPos = rect.y + rect.height + aXPos;
+        aYPos = rect.y + rect.height + aYPos;
       }
       else {
         aXPos = rect.x + rect.width + aXPos;