diff --git a/lib/form/yui/dateselector/dateselector.js b/lib/form/yui/dateselector/dateselector.js
index 1109b22ca7d..9414db09d95 100644
--- a/lib/form/yui/dateselector/dateselector.js
+++ b/lib/form/yui/dateselector/dateselector.js
@@ -220,7 +220,7 @@ YUI.add('moodle-form-dateselector', function(Y) {
                     config.september,
                     config.october,
                     config.november,
-                    config.december ],
+                    config.december ]
             });
             this.calendar.changePageEvent.subscribe(function(){
                 this.fix_position();