diff --git a/tox.ini b/tox.ini
index 01d866b8..07b899ed 100644
--- a/tox.ini
+++ b/tox.ini
@@ -35,7 +35,6 @@ commands = python setup.py testr --coverage --testr-args='{posargs}'
 
 show-source = True
 ignore = E123,E125,H305,H307,H405,H803,H904
-builtins = _
 exclude=.venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build,__init__.py
 
 [hacking]