diff --git a/lib/private/systemtag/systemtagobjectmapper.php b/lib/private/systemtag/systemtagobjectmapper.php
index f2adc2e3ebdc46e02dfbb83f3a102b1c5b4884ae..a4782b064491d728eaf3f5399ef00913c7c3b607 100644
--- a/lib/private/systemtag/systemtagobjectmapper.php
+++ b/lib/private/systemtag/systemtagobjectmapper.php
@@ -96,7 +96,7 @@ class SystemTagObjectMapper implements \OCP\SystemTag\ISystemTagObjectMapper {
 		$this->assertTagsExist($tagIds);
 
 		$query = $this->connection->getQueryBuilder();
-		$query->select($query->createFunction('DISTINCT(objectid)'))
+		$query->select($query->createFunction('DISTINCT(`objectid`)'))
 			->from(self::RELATION_TABLE)
 			->where($query->expr()->in('systemtagid', $query->createParameter('tagids')))
 			->andWhere($query->expr()->eq('objecttype', $query->createParameter('objecttype')))