diff --git a/qinling/db/sqlalchemy/migration/alembic_migrations/env.py b/qinling/db/sqlalchemy/migration/alembic_migrations/env.py
index c1eee756..d5a421c2 100644
--- a/qinling/db/sqlalchemy/migration/alembic_migrations/env.py
+++ b/qinling/db/sqlalchemy/migration/alembic_migrations/env.py
@@ -9,8 +9,6 @@
 #    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 #    See the License for the specific language governing permissions and
 #    limitations under the License.
-
-from __future__ import with_statement
 from alembic import context
 from logging import config as c
 from oslo_utils import importutils