diff --git a/modules/firewall/default-rules.nix b/modules/firewall/default-rules.nix
index e821d70..dcb62aa 100644
--- a/modules/firewall/default-rules.nix
+++ b/modules/firewall/default-rules.nix
@@ -3,13 +3,6 @@ let
   accept = expr : "${expr} accept";
   mcast-scope = 8;
   allow-incoming = false;
-
-  ifname-set = family : name : ifnames : {
-    kind = "set";
-    inherit family name;
-    type = "ifname";
-    elements = ifnames;
-  };
 in {
   bogons-ip6 = {
     type = "filter";