diff --git a/nixpkgs/eval.nix b/nixpkgs/eval.nix
index 6f22246..aeddda5 100644
--- a/nixpkgs/eval.nix
+++ b/nixpkgs/eval.nix
@@ -1,4 +1,4 @@
-let
+{nixpkgs}: let
   buildFor = system:
     import ../. {
       inherit nixpkgs system;