diff --git a/roles/mailman3/defaults/main.yml b/roles/mailman3/defaults/main.yml
index 007888687c6e420933f3f73cd5204abb7b971e90..f8f5a8cbd58a2cc8c52c28eaa66f9c87f52e1ad1 100644
--- a/roles/mailman3/defaults/main.yml
+++ b/roles/mailman3/defaults/main.yml
@@ -85,6 +85,7 @@ lists:
   arch-wiki-admins:
     advertised: false
     archive_policy: private
+    default_nonmember_action: defer
     display_name: Arch-wiki-admins
     subscription_policy: confirm_then_moderate
   arch-women: