diff --git a/synapse/homeserver.yaml b/synapse/homeserver.yaml
index aafa141..d957d9d 100644
--- a/synapse/homeserver.yaml
+++ b/synapse/homeserver.yaml
@@ -42,7 +42,7 @@ serve_server_wellknown: true
 #
 matrix_mautrix_whatsapp_enabled: true
 app_service_config_files:
-- /data/mautrix-whatsapp/registration.yaml
+  - /data/mautrix-whatsapp/registration.yaml
 #
 #auto_join_rooms:
 #  - "#example:example.com"