--- loncom/html/adm/LC_math_editor/src/operator.js	2014/09/24 18:14:39	1.1
+++ loncom/html/adm/LC_math_editor/src/operator.js	2015/02/24 15:20:44	1.2
@@ -18,6 +18,8 @@ through which recipients can access the
 
 */
 
+"use strict";
+
 /**
  * Null denotation function
  * @callback nudFunction