diff --git a/tox.ini b/tox.ini
index 458d16e03..ca5ef4f8f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -63,7 +63,7 @@ commands =
 [flake8]
 show-source = true
 builtins = _
-exclude=.build,.venv,.git,.tox,dist,doc,*lib/python*,*egg,tools,horizon,settings.py,*/local/*
+exclude=build,.venv,.git,.tox,dist,doc,*lib/python*,*egg,tools,horizon,settings.py,*/local/*
 
 [hacking]
 import_exceptions = collections.defaultdict,