diff --git a/tox.ini b/tox.ini
index b35bdc9..711b457 100644
--- a/tox.ini
+++ b/tox.ini
@@ -32,5 +32,4 @@ commands = python setup.py build_sphinx
 [flake8]
 show-source = true
 ignore = H101,H302,H803
-builtins = _
 exclude = .venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,tools,local_settings.py