diff --git a/message/discussion.php b/message/discussion.php
index 10500d86ccf..a588e5eb124 100644
--- a/message/discussion.php
+++ b/message/discussion.php
@@ -25,7 +25,7 @@
  */
 
     require(dirname(dirname(__FILE__)) . '/config.php');
-    require_once(dirname(__FILE__) . '/lib.php');
+    require_once($CFG->dirroot . '/message/lib.php');
 
     //the same URL params as in 1.9
     $userid     = required_param('id', PARAM_INT);
@@ -37,4 +37,4 @@
     }
     $url = new moodle_url('/message/index.php', $params);
     redirect($url);
-?>
\ No newline at end of file
+?>