diff --git a/lib/Service/NotificationService.php b/lib/Service/NotificationService.php
index 02982b7a..02bd906c 100644
--- a/lib/Service/NotificationService.php
+++ b/lib/Service/NotificationService.php
@@ -114,8 +114,7 @@ class NotificationService {
 
 	function deleteNotificationsOfCredential($credential) {
 		$qb = $this->db->getQueryBuilder();
-		$qb->delete()
-			->from('notifications')
+		$qb->delete('notifications')
 			->where($qb->expr()->eq('object_id', $qb->createNamedParameter($credential->getId(), IQueryBuilder::PARAM_INT)))
 			->andWhere($qb->expr()->eq('object_type', 'credential'));
 		return $qb->execute();