diff --git a/modules/monitoring/library/Monitoring/Backend/Ido/Query/DowntimeQuery.php b/modules/monitoring/library/Monitoring/Backend/Ido/Query/DowntimeQuery.php
index 3ff4a9a24..1127a537c 100644
--- a/modules/monitoring/library/Monitoring/Backend/Ido/Query/DowntimeQuery.php
+++ b/modules/monitoring/library/Monitoring/Backend/Ido/Query/DowntimeQuery.php
@@ -5,7 +5,6 @@ namespace Icinga\Module\Monitoring\Backend\Ido\Query;
 
 use Zend_Db_Expr;
 use Zend_Db_Select;
-use Icinga\Authentication\Manager;
 use Icinga\Data\Filter\Filter;
 
 /**