diff --git a/tox.ini b/tox.ini
index ac954b921..828c27dd0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -32,5 +32,4 @@ commands = python setup.py build_sphinx
 
 [flake8]
 ignore = E125,H202,H302,H803
-builtins = _
 exclude =  .venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build,conf.py