diff --git a/Controller.php b/Controller.php
index df1c5cb..2d08edf 100644
--- a/Controller.php
+++ b/Controller.php
@@ -29,6 +29,7 @@ use phpOMS\Module\WebInterface;
 use phpOMS\Views\View;
 use phpOMS\Views\ViewLayout;
 use phpOMS\Account\PermissionType;
+use phpOMS\Message\Http\RequestStatusCode;
 
 /**
  * Calendar controller class.