diff --git a/mozilla/widget/public/nsIContextMenu.h b/mozilla/widget/public/nsIContextMenu.h
index 18130da6840..b508f1264d9 100644
--- a/mozilla/widget/public/nsIContextMenu.h
+++ b/mozilla/widget/public/nsIContextMenu.h
@@ -48,7 +48,7 @@ class nsIContextMenu : public nsISupports {
     * Creates the context menu
     *
     */
-    NS_IMETHOD Create(nsISupports * aParent, const nsString& anAlignment) = 0;
+    NS_IMETHOD Create(nsISupports * aParent, const nsString& anAlignment, const nsString& anAnchorAlignment) = 0;
 
    /**
     * Get the context menu's Parent