diff --git a/tox.ini b/tox.ini
index 003a9d852..5928a3d42 100644
--- a/tox.ini
+++ b/tox.ini
@@ -43,7 +43,6 @@ commands =
 # E711: ignored because it is normal to use "column == None" in sqlalchemy
 
 ignore = E12,E711
-builtins = _
 exclude =  .venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build,*ironic/nova*,tools
 
 [hacking]