diff --git a/course/yui/modchooser/modchooser.js b/course/yui/modchooser/modchooser.js
index 8ade475930e..ed7d9d80b21 100644
--- a/course/yui/modchooser/modchooser.js
+++ b/course/yui/modchooser/modchooser.js
@@ -24,7 +24,6 @@ YUI.add('moodle-course-modchooser', function(Y) {
             var dialogue = Y.one('.chooserdialoguebody');
             var header = Y.one('.choosertitle');
             var params = {
-                width: '540px'
             };
             this.setup_chooser_dialogue(dialogue, header, params);
 
diff --git a/lib/yui/chooserdialogue/chooserdialogue.js b/lib/yui/chooserdialogue/chooserdialogue.js
index 874bb938c6c..f1c45663310 100644
--- a/lib/yui/chooserdialogue/chooserdialogue.js
+++ b/lib/yui/chooserdialogue/chooserdialogue.js
@@ -25,6 +25,7 @@ YUI.add('moodle-core-chooserdialogue', function(Y) {
             var params = {
                 bodyContent : bodycontent.get('innerHTML'),
                 headerContent : headercontent.get('innerHTML'),
+                width : '540px',
                 draggable : true,
                 visible : false, // Hide by default
                 zindex : 100, // Display in front of other items