diff --git a/course/yui/toolboxes/toolboxes.js b/course/yui/toolboxes/toolboxes.js
index b3eb06636b2..d7d031b78b1 100644
--- a/course/yui/toolboxes/toolboxes.js
+++ b/course/yui/toolboxes/toolboxes.js
@@ -479,7 +479,6 @@ YUI.add('moodle-course-toolboxes', function(Y) {
                 .setAttribute('href', newlink)
                 .setAttribute('title', left_string);
             anchor.appendChild(newicon);
-            anchor.on('click', this.move_left, this);
             moveright.insert(anchor, 'before');
         },
         /**