diff --git a/tox.ini b/tox.ini
index f6091b0b..a0eb39fa 100644
--- a/tox.ini
+++ b/tox.ini
@@ -41,9 +41,8 @@ commands = oslo-config-generator --config-file etc/oslo-config-generator/murano.
 [flake8]
 # H233  Python 3.x incompatible use of print operator
 # H405 Multi line docstring summary not separated with an empty line
-# H904  Wrap long lines in parentheses instead of a backslash
 
-ignore = H233,H405,H904
+ignore = H233,H405
 show-source = true
 builtins = _
 exclude=.venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,tools