diff --git a/tox.ini b/tox.ini
index 46ea3d14376..9b9328cd1f1 100644
--- a/tox.ini
+++ b/tox.ini
@@ -45,4 +45,4 @@ commands = {posargs}
 [flake8]
 ignore = E711,E712,F401,F403,F811,F841,H302,H303,H304,H401,H402,H404
 builtins = _
-exclude = .venv,.tox,dist,doc,openstack,*egg
+exclude = .venv,.tox,dist,doc,openstack,*egg,build