diff --git a/lib/private/Preview/BackgroundCleanupJob.php b/lib/private/Preview/BackgroundCleanupJob.php
index 49ff01486a3..deadcd007b1 100644
--- a/lib/private/Preview/BackgroundCleanupJob.php
+++ b/lib/private/Preview/BackgroundCleanupJob.php
@@ -72,6 +72,8 @@ class BackgroundCleanupJob extends TimedJob {
 			))
 			->where(
 				$qb->expr()->isNull('b.fileid')
+			)->andWhere(
+				$qb->expr()->eq('a.storage', $qb->createNamedParameter($this->previewFolder->getStorageId()))
 			)->andWhere(
 				$qb->expr()->eq('a.parent', $qb->createNamedParameter($this->previewFolder->getId()))
 			)->andWhere(