diff --git a/src/services/Gc.php b/src/services/Gc.php
index b711eecc67d..3b234f51c13 100644
--- a/src/services/Gc.php
+++ b/src/services/Gc.php
@@ -556,7 +556,7 @@ private function _deleteOrphanedFkRows(): void
                         } else {
                             $sql = <<<SQL
 DELETE FROM $table->name t
-WHERE t.$fkColumn IS NOT NULL
+WHERE t."$fkColumn" IS NOT NULL
 AND NOT EXISTS (
     SELECT * FROM $refTable
     WHERE "$pkColumn" = t."$fkColumn"