diff --git a/setup/config/config_test.go b/setup/config/config_test.go
index 8a65c990f..eeefb425f 100644
--- a/setup/config/config_test.go
+++ b/setup/config/config_test.go
@@ -54,7 +54,7 @@ global:
   key_id: ed25519:auto
   key_validity_period: 168h0m0s
   well_known_server_name: "localhost:443"
-  well_known_client_name: "localhost:443"
+  well_known_client_name: "https://localhost"
   trusted_third_party_id_servers:
   - matrix.org
   - vector.im