diff --git a/Classes/Service/AuthenticationService.php b/Classes/Service/AuthenticationService.php
index 2c175ef..b2d9b6c 100644
--- a/Classes/Service/AuthenticationService.php
+++ b/Classes/Service/AuthenticationService.php
@@ -271,6 +271,7 @@ protected function convertResourceOwner(array $info)
             ->select('*')
             ->from($userTable)
             ->where(
+                $queryBuilder->expr()->eq('pid', $queryBuilder->createNamedParameter((int)$this->config['usersStoragePid'], \PDO::PARAM_INT)),
                 $queryBuilder->expr()->eq('tx_oidc', $queryBuilder->createNamedParameter($info['sub'], \PDO::PARAM_STR))
             )
             ->execute()