diff --git a/user/filters/yesno.php b/user/filters/yesno.php
index ee22711f2b7..f314a67e9ed 100644
--- a/user/filters/yesno.php
+++ b/user/filters/yesno.php
@@ -15,4 +15,22 @@ class user_filter_yesno extends user_filter_simpleselect {
     function user_filter_yesno($name, $label, $advanced, $field) {
         parent::user_filter_simpleselect($name, $label, $advanced, $field, array(0=>get_string('no'), 1=>get_string('yes')));
     }
+
+    /**
+     * Returns the condition to be used with SQL
+     *
+     * @param array $data filter settings
+     * @return array sql string and $params
+     */
+    function get_sql_filter($data) {
+        static $counter = 0;
+        $name = 'ex_yesno'.$counter++;
+
+        $value = $data['value'];
+        $field = $this->_field;
+        if ($value == '') {
+            return array();
+        }
+        return array("$field=:$name", array($name => $value));
+    }
 }