diff --git a/tox.ini b/tox.ini
index 9dcd30d067..1288424c49 100644
--- a/tox.ini
+++ b/tox.ini
@@ -49,6 +49,7 @@ commands = {posargs}
 # TODO(yuriyz): Analyze or fix the warnings blacklisted below
 ignore = E12,E265,E711
 exclude =  .venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build,tools,*ironic/nova*
+max-complexity=17
 
 [hacking]
 import_exceptions = testtools.matchers, ironic.common.i18n