diff --git a/plugins/Msn/MsnPlugin.php b/plugins/Msn/MsnPlugin.php
index 9db3f7763b..9e0b76d327 100644
--- a/plugins/Msn/MsnPlugin.php
+++ b/plugins/Msn/MsnPlugin.php
@@ -192,6 +192,9 @@ class MsnPlugin extends ImPlugin {
         if (!isset($this->nickname)) {
             throw new Exception("Must specify a nickname");
         }
+        if (!function_exists('mhash')) {
+            require_once(INSTALLDIR.'/plugins/Msn/extlib/compat/mhash.php');
+        }
 
         return true;
     }