diff --git a/core/userrights.class.inc.php b/core/userrights.class.inc.php
index 6f4671dfd..f5ce8be9b 100644
--- a/core/userrights.class.inc.php
+++ b/core/userrights.class.inc.php
@@ -428,7 +428,7 @@ class UserRights
 	{
 		if (self::$m_sSelfRegisterAddOn != null)
 		{
-			call_user_func(array($m_sSelfRegisterAddOn, 'UpdateUser'), $oUser, $sLoginMode, $sAuthentication);
+			call_user_func(array(self::$m_sSelfRegisterAddOn, 'UpdateUser'), $oUser, $sLoginMode, $sAuthentication);
 		}
 	}