diff --git a/message/output/jabber/message_output_jabber.php b/message/output/jabber/message_output_jabber.php
index 8969277b482..8c2cafdecbb 100644
--- a/message/output/jabber/message_output_jabber.php
+++ b/message/output/jabber/message_output_jabber.php
@@ -97,7 +97,7 @@ class message_output_jabber extends message_output {
         if (!message_output_jabber::_jabber_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).'" />';
         }
     }