diff --git a/apps/files/lib/BackgroundJob/ScanFiles.php b/apps/files/lib/BackgroundJob/ScanFiles.php
index 3a39382d0b4aa..f3f9093d64819 100644
--- a/apps/files/lib/BackgroundJob/ScanFiles.php
+++ b/apps/files/lib/BackgroundJob/ScanFiles.php
@@ -69,7 +69,7 @@ private function getUserToScan() {
 			$query->select('m.user_id')
 				->from('filecache', 'f')
 				->leftJoin('f', 'mounts', 'm', $query->expr()->eq('m.storage_id', 'f.storage'))
-				->where($query->expr()->lt('f.size', $query->createNamedParameter(0, IQueryBuilder::PARAM_INT)))
+				->where($query->expr()->eq('f.size', $query->createNamedParameter(-1, IQueryBuilder::PARAM_INT)))
 				->andWhere($query->expr()->gt('f.parent', $query->createNamedParameter(-1, IQueryBuilder::PARAM_INT)))
 				->setMaxResults(10)
 				->groupBy('f.storage')
@@ -90,7 +90,7 @@ private function getUserToScan() {
 			$query->select('m.user_id')
 				->from('filecache', 'f')
 				->leftJoin('f', 'mounts', 'm', $query->expr()->eq('m.storage_id', 'f.storage'))
-				->where($query->expr()->lt('f.size', $query->createNamedParameter(0, IQueryBuilder::PARAM_INT)))
+				->where($query->expr()->eq('f.size', $query->createNamedParameter(-1, IQueryBuilder::PARAM_INT)))
 				->andWhere($query->expr()->gt('f.parent', $query->createNamedParameter(-1, IQueryBuilder::PARAM_INT)))
 				->andWhere($query->expr()->in('f.storage', $query->createNamedParameter($storages, IQueryBuilder::PARAM_INT_ARRAY)))
 				->setMaxResults(1)
@@ -101,7 +101,7 @@ private function getUserToScan() {
 			$query->select('m.user_id')
 				->from('filecache', 'f')
 				->innerJoin('f', 'mounts', 'm', $query->expr()->eq('m.storage_id', 'f.storage'))
-				->where($query->expr()->lt('f.size', $query->createNamedParameter(0, IQueryBuilder::PARAM_INT)))
+				->where($query->expr()->eq('f.size', $query->createNamedParameter(-1, IQueryBuilder::PARAM_INT)))
 				->andWhere($query->expr()->gt('f.parent', $query->createNamedParameter(-1, IQueryBuilder::PARAM_INT)))
 				->setMaxResults(1)
 				->runAcrossAllShards();