diff --git a/ui/jquery.ui.core.js b/ui/jquery.ui.core.js
index 17fad86b4..bd3e30758 100644
--- a/ui/jquery.ui.core.js
+++ b/ui/jquery.ui.core.js
@@ -289,8 +289,6 @@ $.extend( $.ui, {
 		}
 	},
 
-	contains: $.contains,
-
 	// only used by resizable
 	hasScroll: function( el, a ) {