diff --git a/tox.ini b/tox.ini
index 13238b1e..7d12799b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -64,7 +64,7 @@ commands =
 [flake8]
 # E731 skipped as assign a lambda expression
 # W504 line break after binary operator
-ignore = E731,F403,F812,F821,W504
+ignore = E731,W504
 show-source = True
 exclude = .venv*,.tox,dist,*egg,build,.git,doc,*lib/python*,.update-venv