diff --git a/tox.ini b/tox.ini
index 235720aa2cc..722efe15a54 100644
--- a/tox.ini
+++ b/tox.ini
@@ -144,10 +144,9 @@ commands = sphinx-build -W -b linkcheck doc/source doc/build/linkcheck
 # N530 direct neutron imports not allowed
 # TODO(ihrachys) figure out what to do with N534 and N536
 # N534 Untranslated exception message
-# N536 Use assertIsNone rather than assertEqual to check for None values
 # TODO(amotoki) check the following new rules should be fixed or ignored
 # E731 do not assign a lambda expression, use a def
-ignore = E125,E126,E128,E129,E265,E731,H404,H405,N530,N534,N536
+ignore = E125,E126,E128,E129,E265,E731,H404,H405,N530,N534
 # H106: Don't put vim configuration in source files
 # H203: Use assertIs(Not)None to check for None
 # H204: Use assert(Not)Equal to check for equality