diff --git a/flake.nix b/flake.nix
index e0f51cd..1a38a1f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -26,6 +26,7 @@
       apps.nixos-diff = {
         type = "app";
         program = "${pkgs.writeShellScript "nixos-diff.sh" ''
+          ${pkgs.git}/bin/git checkout flake.lock
           ${pkgs.git}/bin/git pull --ff-only
           ${pkgs.nix}/bin/nix flake update
           ${pkgs.nixos-rebuild}/bin/nixos-rebuild build --log-format internal-json -v |& ${pkgs.nix-output-monitor}/bin/nom --json