diff --git a/tox.ini b/tox.ini
index 71557f55..d7a14ff4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -42,7 +42,7 @@ commands = python setup.py build_sphinx
 # H904 Wrap long lines in parentheses instead of a backslash
 ignore = E125,E126,E128,E129,E265,H301,H305,H307,H402,H404,H405,H904
 show-source = true
-builtins = _
+
 # TODO(dougw) neutron/tests/unit/vmware exclusion is a temporary services split hack
 exclude = .venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build,tools,.ropeproject,rally-scenarios,neutron/tests/unit/vmware*