diff --git a/lib/form/yui/dateselector/dateselector.js b/lib/form/yui/dateselector/dateselector.js
index 6f9e1db6660..3a94c45b83c 100644
--- a/lib/form/yui/dateselector/dateselector.js
+++ b/lib/form/yui/dateselector/dateselector.js
@@ -183,7 +183,6 @@ YUI.add('moodle-form-dateselector', function(Y) {
         initPanel : function(config) {
             this.panel = new Y.Overlay({
                 visible : false,
-                constrain : true,
                 bodyContent : Y.Node.create('<div id="dateselector-calendar-content"></div>'),
                 id : 'dateselector-calendar-panel'
             });