diff --git a/neutron_dynamic_routing/db/migration/alembic_migrations/versions/queens/contract/a589fdb5724c_change_size_of_as_number.py b/neutron_dynamic_routing/db/migration/alembic_migrations/versions/queens/contract/a589fdb5724c_change_size_of_as_number.py
index ca7f7a4d..22780a8f 100644
--- a/neutron_dynamic_routing/db/migration/alembic_migrations/versions/queens/contract/a589fdb5724c_change_size_of_as_number.py
+++ b/neutron_dynamic_routing/db/migration/alembic_migrations/versions/queens/contract/a589fdb5724c_change_size_of_as_number.py
@@ -19,15 +19,16 @@ Create Date: 2017-08-31 13:50:28.324422
 
 """
 
-# revision identifiers, used by Alembic.
-revision = 'a589fdb5724c'
-down_revision = '4cf8bc3edb66'
-
 from alembic import op
 import sqlalchemy as sa
 
 from neutron.db import migration
 
+
+# revision identifiers, used by Alembic.
+revision = 'a589fdb5724c'
+down_revision = '4cf8bc3edb66'
+
 # milestone identifier, used by neutron-db-manage
 neutron_milestone = [migration.QUEENS]