diff --git a/classes/submission/DAO.php b/classes/submission/DAO.php
index 0484d55014b..ed370621dd5 100644
--- a/classes/submission/DAO.php
+++ b/classes/submission/DAO.php
@@ -26,6 +26,7 @@
 use PKP\db\DAORegistry;
 use PKP\log\event\EventLogEntry;
 use PKP\note\Note;
+use PKP\notification\Notification;
 use PKP\query\QueryDAO;
 use PKP\services\PKPSchemaService;
 use PKP\stageAssignment\StageAssignment;