diff --git a/profiles/core/default.nix b/profiles/core/default.nix
index 0f8dad3..94fdbbd 100644
--- a/profiles/core/default.nix
+++ b/profiles/core/default.nix
@@ -4,6 +4,7 @@ in
 {
 
   nix.systemFeatures = [ "nixos-test" "benchmark" "big-parallel" "kvm" ];
+  nix.registry.nixpkgs.flake = self.inputs.nixos;
 
   environment = {
     systemPackages = with pkgs; [