diff --git a/synapse/config/registration.py b/synapse/config/registration.py
index 14ef535b2..6cd830a78 100644
--- a/synapse/config/registration.py
+++ b/synapse/config/registration.py
@@ -33,7 +33,9 @@ class RegistrationConfig(Config):
 
         self.registrations_require_3pid = config.get("registrations_require_3pid", [])
         self.allowed_local_3pids = config.get("allowed_local_3pids", [])
-        self.check_is_for_allowed_local_3pids = config.get("check_is_for_allowed_local_3pids", False)
+        self.check_is_for_allowed_local_3pids = config.get(
+            "check_is_for_allowed_local_3pids", False
+        )
         self.registration_shared_secret = config.get("registration_shared_secret")
 
         self.bcrypt_rounds = config.get("bcrypt_rounds", 12)
diff --git a/synapse/handlers/register.py b/synapse/handlers/register.py
index 87d0a4580..96f480f83 100644
--- a/synapse/handlers/register.py
+++ b/synapse/handlers/register.py
@@ -308,7 +308,9 @@ class RegistrationHandler(BaseHandler):
             logger.info("got threepid with medium '%s' and address '%s'",
                         threepid['medium'], threepid['address'])
 
-            if not (yield check_3pid_allowed(self.hs, threepid['medium'], threepid['address'])):
+            if not (
+                yield check_3pid_allowed(self.hs, threepid['medium'], threepid['address'])
+            ):
                 raise RegistrationError(
                     403, "Third party identifier is not allowed"
                 )
diff --git a/synapse/util/threepids.py b/synapse/util/threepids.py
index d2f646db9..e1cf5dbb1 100644
--- a/synapse/util/threepids.py
+++ b/synapse/util/threepids.py
@@ -40,7 +40,7 @@ def check_3pid_allowed(hs, medium, address):
                 hs.config.check_is_for_allowed_local_3pids,
                 "/_matrix/identity/api/v1/discover_urls"
             ),
-            {'medium': medium, 'address': address }
+            {'medium': medium, 'address': address}
         )
         defer.returnValue(data['hs_url'] + "/" == hs.config.public_baseurl)
         return