diff --git a/tox.ini b/tox.ini
index bb3d2799b..e295a58dd 100644
--- a/tox.ini
+++ b/tox.ini
@@ -82,6 +82,9 @@ commands = pifpaf -g AODH_TEST_STORAGE_URL run postgresql -- oslo_debug_helper {
 [flake8]
 ignore =
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build,install-guide
+# [H106] Don't put vim configuration in source files.
+# [H203] Use assertIs(Not)None to check for None.
+enable-extensions=H106,H203
 show-source = True
 
 [hacking]