diff --git a/lib/form/yui/dateselector/dateselector.js b/lib/form/yui/dateselector/dateselector.js
index 371e82f4123..d403547a9de 100644
--- a/lib/form/yui/dateselector/dateselector.js
+++ b/lib/form/yui/dateselector/dateselector.js
@@ -222,7 +222,7 @@ YUI.add('moodle-form-dateselector', function(Y) {
         },
         fix_position : function() {
             if (this.currentowner) {
-                this.panel.set('constrain', this.currentowner.get('node').ancestor('form'));
+                this.panel.set('constrain', Y.one(document.body));
                 this.panel.set('align', {
                     node:this.currentowner.get('node').one('select'),
                     points:[Y.WidgetPositionAlign.BL, Y.WidgetPositionAlign.TL]