diff --git a/nixos/hosts/nixos-vm-01/default.nix b/nixos/hosts/nixos-vm-01/default.nix
index 7d1f1173..eff174a5 100644
--- a/nixos/hosts/nixos-vm-01/default.nix
+++ b/nixos/hosts/nixos-vm-01/default.nix
@@ -15,8 +15,10 @@
   networking.useDHCP = lib.mkDefault true;
   nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
   virtualisation.virtualbox.guest.enable = true;
-  # Set your time zone.
   time.timeZone = "Asia/Tokyo";
-  # Set the networking hostname:
   networking.hostName = "nixos-vm-01";
+
+  boot.loader.enable = true;
+  boot.loader.grub.device = '/dev/sda';
+  boot.loader.grub.useOSProber = true;
 }