diff --git a/lib/pluginlib.php b/lib/pluginlib.php
index b1139ebe8e0..afde9564b72 100644
--- a/lib/pluginlib.php
+++ b/lib/pluginlib.php
@@ -378,7 +378,7 @@ class plugin_manager {
             ),
 
             'assignfeedback' => array(
-                'comments', 'file'
+                'comments', 'file', 'offline'
             ),
 
             'auth' => array(