diff --git a/tox.ini b/tox.ini
index 2f7131db..74aa87e1 100644
--- a/tox.ini
+++ b/tox.ini
@@ -20,6 +20,6 @@ commands = {posargs}
 [flake8]
 # E123, E125 skipped as they are invalid PEP-8.
 show-source = True
-ignore = E123,E125,W503, E501
+ignore = E123,E125,W503,E501
 builtins = _
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build