diff --git a/synapse/api/auth.py b/synapse/api/auth.py
index 84bc0398fd..8d2ba242e1 100644
--- a/synapse/api/auth.py
+++ b/synapse/api/auth.py
@@ -14,6 +14,7 @@
 # limitations under the License.
 
 """This module contains classes for authenticating the user."""
+
 from twisted.internet import defer
 
 from synapse.api.constants import Membership