diff --git a/tox.ini b/tox.ini
index e6e2296..02f3eeb 100644
--- a/tox.ini
+++ b/tox.ini
@@ -45,7 +45,6 @@ commands = python setup.py testr --coverage --testr-args='{posargs}'
 
 show-source = True
 ignore = H305,H307,H405,E126
-builtins = _
 exclude=.venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build
 
 [hacking]