diff --git a/tox.ini b/tox.ini
index 1ee6e4bff..043767cad 100644
--- a/tox.ini
+++ b/tox.ini
@@ -96,6 +96,7 @@ commands = bandit -r oslo_messaging -x tests -n5
 
 [flake8]
 show-source = True
+enable-extensions = H203,H106
 ignore = H405
 exclude = .tox,dist,doc,*.egg,build,__init__.py