diff --git a/nix-os/core.nix b/nix-os/core.nix
index 39ae485..34c6f41 100644
--- a/nix-os/core.nix
+++ b/nix-os/core.nix
@@ -29,6 +29,7 @@
       "systemNixpkgs=${pkgs.selfExpr { useConfig = true; name = "systemNixpkgs-self"; }}"
       # don't garbage collect the nixpkgs input
       "inputsNixpkgs=${inputs.nixpkgs}"
+      "nixos-system=/etc/nixos/default.nix"
     ];
   };