diff --git a/neutron_lib/api/extensions.py b/neutron_lib/api/extensions.py
index 1443b8440..d7cd26fb4 100644
--- a/neutron_lib/api/extensions.py
+++ b/neutron_lib/api/extensions.py
@@ -14,6 +14,7 @@
 #    under the License.
 
 import abc
+
 import six
 
 from neutron_lib._i18n import _
diff --git a/neutron_lib/api/validators/__init__.py b/neutron_lib/api/validators/__init__.py
index fabc21d05..9a855b46d 100644
--- a/neutron_lib/api/validators/__init__.py
+++ b/neutron_lib/api/validators/__init__.py
@@ -11,10 +11,10 @@
 #    under the License.
 
 import collections
-import re
-
 import functools
 import inspect
+import re
+
 import netaddr
 from oslo_log import log as logging
 from oslo_utils import netutils
diff --git a/neutron_lib/fixture.py b/neutron_lib/fixture.py
index 94735fe08..59296438f 100644
--- a/neutron_lib/fixture.py
+++ b/neutron_lib/fixture.py
@@ -11,6 +11,7 @@
 # under the License.
 
 import copy
+
 import fixtures
 import mock
 
diff --git a/neutron_lib/plugins/ml2/api.py b/neutron_lib/plugins/ml2/api.py
index 5fa651300..52d080712 100644
--- a/neutron_lib/plugins/ml2/api.py
+++ b/neutron_lib/plugins/ml2/api.py
@@ -13,6 +13,7 @@
 #    under the License.
 
 import abc
+
 import six
 
 
diff --git a/neutron_lib/tests/_tools.py b/neutron_lib/tests/_tools.py
index eb4ff0802..0992c2c61 100644
--- a/neutron_lib/tests/_tools.py
+++ b/neutron_lib/tests/_tools.py
@@ -13,10 +13,11 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import fixtures
 import platform
 import warnings
 
+import fixtures
+
 from neutron_lib.utils import helpers
 
 
diff --git a/test-requirements.txt b/test-requirements.txt
index 9dc5c7813..51dd0cf80 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -6,6 +6,7 @@ hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
 
 coverage!=4.4,>=4.0 # Apache-2.0
 fixtures>=3.0.0 # Apache-2.0/BSD
+flake8-import-order==0.12 # LGPLv3
 python-subunit>=0.0.18 # Apache-2.0/BSD
 sphinx>=1.6.2 # BSD
 openstackdocstheme>=1.11.0 # Apache-2.0
diff --git a/tox.ini b/tox.ini
index cda97a39a..76f3b9611 100644
--- a/tox.ini
+++ b/tox.ini
@@ -53,6 +53,7 @@ commands =
 enable-extensions=H904
 show-source = True
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build,tools
+import-order-style = pep8
 
 [hacking]
 import_exceptions = neutron_lib._i18n