diff --git a/tox.ini b/tox.ini
index 45bc2f2de..4bf68085e 100644
--- a/tox.ini
+++ b/tox.ini
@@ -47,7 +47,6 @@ commands = python setup.py build_sphinx
 
 [flake8]
 show-source = True
-ignore = H402
 builtins = _
 exclude=.venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build,releasenotes