diff --git a/configs/nixos/registry/route.nix b/configs/nixos/registry/route.nix
index ec1fc39..397a705 100644
--- a/configs/nixos/registry/route.nix
+++ b/configs/nixos/registry/route.nix
@@ -53,8 +53,10 @@ in
     {
       assertion =
         entries:
-        util.registry.predicates.uniqueValue lib.id (
-          lib.concatMap (entry: entry.value.ports) (lib.filter (entry: entry.value.protocol == "udp") entries)
+        util.registry.predicates.uniqueValue (entry: entry.value) (
+          lib.concatMap (entry: map (port: entry // { value = port; }) entry.value.ports) (
+            lib.filter (entry: entry.value.protocol == "udp") entries
+          )
         );
       message = "Route UDP ports must be unique.";
     }