diff --git a/nova_lxd/tests/session/test_container.py b/nova_lxd/tests/session/test_container.py
index 21afad34..e3a39fc4 100644
--- a/nova_lxd/tests/session/test_container.py
+++ b/nova_lxd/tests/session/test_container.py
@@ -32,6 +32,7 @@ from nova_lxd.nova.virt.lxd.session import session
 from nova_lxd.tests import fake_api
 from nova_lxd.tests import stubs
 
+
 @ddt.ddt
 class SessionContainerTest(test.NoDBTestCase):
 
@@ -191,7 +192,7 @@ class SessionContainerTest(test.NoDBTestCase):
         container_config returns a dictionary representation
         of the LXD container. Verify that the funciton returns 
         a container_config
-        """ 
+        """
         instance = stubs._fake_instance()
         self.ml.get_container_config.return_value = \
             (200, fake_api.fake_container_config())
diff --git a/tox.ini b/tox.ini
index 2bcd66d5..95e73bec 100644
--- a/tox.ini
+++ b/tox.ini
@@ -33,6 +33,6 @@ commands = python setup.py build_sphinx
 # E123, E125 skipped as they are invalid PEP-8.
 
 show-source = True
-ignore = E123,E125,H803,H904,H405
+ignore = E123,E125,H803,H904,H405,H404
 builtins = _
 exclude=.venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build,tools/colorizer.py