diff --git a/tox.ini b/tox.ini
index ae96483a9b..16e442f0ff 100644
--- a/tox.ini
+++ b/tox.ini
@@ -46,4 +46,4 @@ commands = {posargs}
 ignore = E711,E712,E125,H302,H404
 show-source = true
 builtins = _
-exclude=.venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,tools
+exclude = .venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build,tools