diff --git a/lib/private/User/Manager.php b/lib/private/User/Manager.php
index cf40fc19dd2c5..ff3ab563003c2 100644
--- a/lib/private/User/Manager.php
+++ b/lib/private/User/Manager.php
@@ -642,6 +642,7 @@ private function verifyUid(string $uid): bool {
 		if (\in_array($uid, [
 			'.htaccess',
 			'files_external',
+			'__groupfolders',
 			'.ocdata',
 			'owncloud.log',
 			'nextcloud.log',