diff --git a/lib/macosSystem.nix b/lib/macosSystem.nix
index 2fd90454..e69cb415 100644
--- a/lib/macosSystem.nix
+++ b/lib/macosSystem.nix
@@ -18,13 +18,6 @@ in
       ++ [
         ({lib, ...}: {
           nixpkgs.pkgs = import nixpkgs {inherit system;};
-          # make `nix run nixpkgs#nixpkgs` use the same nixpkgs as the one used by this flake.
-          nix.registry.nixpkgs.flake = nixpkgs;
-
-          environment.etc."nix/inputs/nixpkgs".source = "${nixpkgs}";
-          # make `nix repl '<nixpkgs>'` use the same nixpkgs as the one used by this flake.
-          # discard all the default paths, and only use the one from this flake.
-          nix.nixPath = lib.mkForce ["/etc/nix/inputs"];
         })
       ]
       ++ (
diff --git a/modules/darwin/nix-core.nix b/modules/darwin/nix-core.nix
index 992be3a0..3d795ea6 100644
--- a/modules/darwin/nix-core.nix
+++ b/modules/darwin/nix-core.nix
@@ -1,4 +1,8 @@
-{pkgs, ...}: {
+{
+  lib,
+  nixpkgs,
+  ...
+}: {
   ###################################################################################
   #
   #  Core configuration for nix-darwin
@@ -24,4 +28,12 @@
   nix.settings.auto-optimise-store = false;
 
   nix.gc.automatic = false;
+
+  # make `nix run nixpkgs#nixpkgs` use the same nixpkgs as the one used by this flake.
+  nix.registry.nixpkgs.flake = nixpkgs;
+
+  environment.etc."nix/inputs/nixpkgs".source = "${nixpkgs}";
+  # make `nix repl '<nixpkgs>'` use the same nixpkgs as the one used by this flake.
+  # discard all the default paths, and only use the one from this flake.
+  nix.nixPath = lib.mkForce ["/etc/nix/inputs"];
 }