diff --git a/tox.ini b/tox.ini
index b1d225e00..83fe4a825 100644
--- a/tox.ini
+++ b/tox.ini
@@ -50,6 +50,7 @@ commands = python setup.py build_sphinx
 
 [flake8]
 show-source = true
+enable-extensions = H106,H203
 
 # TODO(dougw) neutron/tests/unit/vmware exclusion is a temporary services split hack
 exclude = .venv,.git,.tox,dist,doc,*lib/python*,*egg,build,tools,.ropeproject,rally-scenarios,neutron/tests/unit/vmware*