diff --git a/message/output/jabber/message_output_jabber.php b/message/output/jabber/message_output_jabber.php
index 92eb8a8a994..1fe3ab5e760 100644
--- a/message/output/jabber/message_output_jabber.php
+++ b/message/output/jabber/message_output_jabber.php
@@ -93,7 +93,7 @@ class message_output_jabber extends message_output {
         if (!$this->is_system_configured()) {
             return get_string('notconfigured','message_jabber');
         } else {
-            return get_string('jabberid', 'message_jabber').': <input size="30" name="jabber_jabberid" value="'.$preferences->jabber_jabberid.'" />';
+            return get_string('jabberid', 'message_jabber').': <input size="30" name="jabber_jabberid" value="'.s($preferences->jabber_jabberid).'" />';
         }
     }