diff --git a/synapse/handlers/auth.py b/synapse/handlers/auth.py
index 1b0971e13d..e043363176 100644
--- a/synapse/handlers/auth.py
+++ b/synapse/handlers/auth.py
@@ -321,7 +321,8 @@ class AuthHandler(BaseHandler):
         macaroon = pymacaroons.Macaroon(
             location=self.hs.config.server_name,
             identifier="key",
-            key=self.hs.config.macaroon_secret_key)
+            key=self.hs.config.macaroon_secret_key
+        )
         macaroon.add_first_party_caveat("gen = 1")
         macaroon.add_first_party_caveat("user_id = %s" % (user_id,))
         macaroon.add_first_party_caveat("type = access")