diff --git a/tox.ini b/tox.ini
index 5f4c7045..8fbb5967 100644
--- a/tox.ini
+++ b/tox.ini
@@ -29,5 +29,4 @@ commands = python setup.py testr --coverage --testr-args='{posargs}'
 
 show-source = True
 ignore = E123,E125,H803
-builtins = _
 exclude=.venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build