diff --git a/keystoneclient/v3/contrib/federation/base.py b/keystoneclient/v3/contrib/federation/base.py
index 154365dc3..0160170ea 100644
--- a/keystoneclient/v3/contrib/federation/base.py
+++ b/keystoneclient/v3/contrib/federation/base.py
@@ -11,6 +11,7 @@
 #    under the License.
 
 import abc
+
 import six
 
 from keystoneclient.auth import base as base_auth