diff --git a/synapse/handlers/register.py b/synapse/handlers/register.py
index 1799a668c6..ba26d13d49 100644
--- a/synapse/handlers/register.py
+++ b/synapse/handlers/register.py
@@ -119,7 +119,7 @@ class RegistrationHandler(BaseHandler):
                 token=token,
                 password_hash=password_hash,
                 was_guest=guest_access_token is not None,
-                make_guest=make_guest
+                make_guest=make_guest,
             )
 
             yield registered_user(self.distributor, user)