diff --git a/lib/form/selectyesno.php b/lib/form/selectyesno.php
index c5eb181711b..d88a276c08c 100644
--- a/lib/form/selectyesno.php
+++ b/lib/form/selectyesno.php
@@ -51,7 +51,7 @@ class MoodleQuickForm_selectyesno extends MoodleQuickForm_select{
     {
         HTML_QuickForm_element::HTML_QuickForm_element($elementName, $elementLabel, $attributes, null);
         $this->_type = 'selectyesno';
-
+        $this->_persistantFreeze = true;
     }
 
     /**