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-rw-r--r--lib/private/Lock/DBLockingProvider.php2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/private/Lock/DBLockingProvider.php b/lib/private/Lock/DBLockingProvider.php
index 6adb7488217..0c5f4fa2010 100644
--- a/lib/private/Lock/DBLockingProvider.php
+++ b/lib/private/Lock/DBLockingProvider.php
@@ -303,7 +303,7 @@ class DBLockingProvider extends AbstractLockingProvider {
$builder = $this->connection->getQueryBuilder();
$query = $builder->update('file_locks')
- ->set('lock', $builder->createFunction('`lock` -1'))
+ ->set('lock', $builder->func()->subtract('lock', $builder->expr()->literal(1)))
->where($builder->expr()->in('key', $builder->createNamedParameter($chunk, IQueryBuilder::PARAM_STR_ARRAY)))
->andWhere($builder->expr()->gt('lock', new Literal(0)));