diff --git a/tox.ini b/tox.ini
index b2e72578b..0d6c4c698 100644
--- a/tox.ini
+++ b/tox.ini
@@ -72,12 +72,11 @@ commands = {posargs}
 # H104 file contains nothing but comments
 # H237 module is removed in Python 3
 # H302 import only modules
-# H304 no relative imports
 # H402 one line docstring needs punctuation
 # H405 multi line docstring summary not separated with an empty line
 # H904 Wrap long lines in parentheses instead of a backslash
 # TODO(marun) H404 multi line docstring should start with a summary
-ignore = E125,E126,E128,E129,E251,E265,E713,F402,F811,F812,H237,H302,H304,H402,H404,H405,H904
+ignore = E125,E126,E128,E129,E251,E265,E713,F402,F811,F812,H237,H302,H402,H404,H405,H904
 show-source = true
 builtins = _
 exclude = .venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build,tools,.ropeproject