diff --git a/tox.ini b/tox.ini
index 49e11216..5ef8cc38 100644
--- a/tox.ini
+++ b/tox.ini
@@ -58,4 +58,5 @@ show-source = True
 # E123, E125 skipped as they are invalid PEP-8.
 # H405 multi line docstring summary not separated with an empty line
 ignore = E123,E125,H405
+enable-extensions = H203,H106
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build,.ropeproject,tools