diff --git a/tox.ini b/tox.ini
index 5911b4f5..c9f4a276 100644
--- a/tox.ini
+++ b/tox.ini
@@ -73,6 +73,7 @@ commands = pylint --rcfile .pylintrc freezer
 [flake8]
 ignore = H405,H404,H403,H401
 show-source = True
+enable-extensions = H203,H106
 exclude = .venv,.tox,dist,doc,test,*egg,releasenotes
 
 [testenv:install-guide]