diff --git a/default.nix b/default.nix
index b8ae573..8c24ce6 100644
--- a/default.nix
+++ b/default.nix
@@ -2,10 +2,10 @@ let
   perform =
     {
       lib ? null,
-      filterf ? null,
-      mapf ? null,
       pipef ? null,
-      paths ? [ ],
+      filterf,
+      mapf,
+      paths,
       ...
     }:
     path: