diff --git a/app/call_forward/resources/classes/do_not_disturb.php b/app/call_forward/resources/classes/do_not_disturb.php
index 3d6027ea98..a54e436e08 100644
--- a/app/call_forward/resources/classes/do_not_disturb.php
+++ b/app/call_forward/resources/classes/do_not_disturb.php
@@ -261,7 +261,6 @@
 
 								//synchronize configuration
 									if (!empty($_SESSION['switch']['extensions']['dir']) && is_readable($_SESSION['switch']['extensions']['dir'])) {
-										require_once "app/extensions/resources/classes/extension.php";
 										$ext = new extension;
 										$ext->xml();
 										unset($ext);