diff --git a/typo3/sysext/scheduler/Classes/Task/OptimizeDatabaseTableAdditionalFieldProvider.php b/typo3/sysext/scheduler/Classes/Task/OptimizeDatabaseTableAdditionalFieldProvider.php
index b38af5e64ead..66b8068e7b9c 100644
--- a/typo3/sysext/scheduler/Classes/Task/OptimizeDatabaseTableAdditionalFieldProvider.php
+++ b/typo3/sysext/scheduler/Classes/Task/OptimizeDatabaseTableAdditionalFieldProvider.php
@@ -216,7 +216,7 @@ protected function getOptimizableTablesForConnection(Connection $connection, arr
             $queryBuilder->andWhere(
                 $queryBuilder->expr()->in(
                     'TABLE_NAME',
-                    $queryBuilder->createNamedParameter($tableNames)
+                    $queryBuilder->createNamedParameter($tableNames, Connection::PARAM_STR_ARRAY)
                 )
             );
         }