diff --git a/flake.nix b/flake.nix
index 549405c..69f1de9 100644
--- a/flake.nix
+++ b/flake.nix
@@ -6,10 +6,9 @@
     flake-utils.url = "github:numtide/flake-utils";
   };
 
-  outputs = { self, nixpkgs, flake-utils }:
+  outputs = { nixpkgs, flake-utils, ... }:
     flake-utils.lib.eachDefaultSystem (system:
       let
-        inherit (nixpkgs) lib;
         pkgs = import nixpkgs { inherit system; };
         zig = pkgs.zig_0_11;
         buildZigPackage = import ./nix/build-zig-package.nix {
@@ -29,7 +28,7 @@
 
         packages.default = buildZigPackage {
           name = "aoc23";
-          src = lib.cleanSource ./.;
+          src = pkgs.nix-gitignore.gitignoreSource [ ] ./.;
         };
       });
 }