diff --git a/tox.ini b/tox.ini
index 2ffcc1b28..e20a932c3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -62,6 +62,7 @@ commands =
   bash tools/pretty_tox.sh '{posargs}'
 
 [flake8]
+filename = *.py,app.wsgi
 show-source = True
 # [H904] Delay string interpolations at logging calls.
 enable-extensions = H203,H106,H904