diff --git a/tox.ini b/tox.ini
index 1c8fa5026..a788e9e10 100644
--- a/tox.ini
+++ b/tox.ini
@@ -32,5 +32,4 @@ commands = oslo_debug_helper {posargs}
 
 show-source = True
 ignore = E123,E125,F403,H102,H303
-builtins = _
 exclude=.venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build