diff --git a/default.nix b/default.nix
index 151184f..10a0629 100644
--- a/default.nix
+++ b/default.nix
@@ -1,10 +1,7 @@
 { pkgs ? import <nixpkgs> { }
-, agent_src
+, agent
 }:
 with pkgs;
-let
-  agent = callPackage "${agent_src}/default.nix" { };
-in
 rustPlatform.buildRustPackage {
   name = "agent-harness";
   src = nix-gitignore.gitignoreSource [ ] ./.;