diff --git a/tox.ini b/tox.ini
index 69cba70..e7f295c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -80,3 +80,4 @@ filterwarnings =
 # remind us later
   once:.*staticfiles.*::django\..*
   once:please use dns.resolver.resolve
+  once