diff --git a/tox.ini b/tox.ini
index fbbdaa0ae9..a01fd3fead 100644
--- a/tox.ini
+++ b/tox.ini
@@ -67,6 +67,7 @@ exclude = .venv,.git,.tox,dist,*openstack/common*,*lib/python*,*egg,build,panel_
 # H803 git commit title should not end with period (disabled on purpose, see bug #1236621)
 # H904 Wrap long lines in parentheses instead of a backslash
 ignore = H307,H405,H803,H904
+max-complexity=33
 
 [hacking]
 import_exceptions = collections.defaultdict,