diff --git a/apps/files_sharing/lib/Controller/ShareAPIController.php b/apps/files_sharing/lib/Controller/ShareAPIController.php
index 461c0e47320b3..308e7bbb7429a 100644
--- a/apps/files_sharing/lib/Controller/ShareAPIController.php
+++ b/apps/files_sharing/lib/Controller/ShareAPIController.php
@@ -113,7 +113,7 @@ public function __construct(
 		IUserManager $userManager,
 		IRootFolder $rootFolder,
 		IURLGenerator $urlGenerator,
-		string $userId,
+		string $userId = null,
 		IL10N $l10n,
 		IConfig $config,
 		IAppManager $appManager,