diff --git a/apps/settings/lib/SetupChecks/WellKnownUrls.php b/apps/settings/lib/SetupChecks/WellKnownUrls.php
index 9fdaca996b867..4eeaff8f3c419 100644
--- a/apps/settings/lib/SetupChecks/WellKnownUrls.php
+++ b/apps/settings/lib/SetupChecks/WellKnownUrls.php
@@ -45,7 +45,7 @@ public function run(): SetupResult {
 		}
 
 		$urls = [
-			['get', '/.well-known/webfinger', [200, 404], true],
+			['get', '/.well-known/webfinger', [200, 400, 404], true], // 400 indicates a handler is installed but (correctly) failed because we didn't specify a resource
 			['get', '/.well-known/nodeinfo', [200, 404], true],
 			['propfind', '/.well-known/caldav', [207], false],
 			['propfind', '/.well-known/carddav', [207], false],