diff --git a/hosts/earth/configuration.nix b/hosts/earth/configuration.nix
index 112051d..7ed0028 100644
--- a/hosts/earth/configuration.nix
+++ b/hosts/earth/configuration.nix
@@ -13,6 +13,14 @@
     ./hardware-configuration.nix
     ./nvidia.nix
     ../../env/wayland
+    ({
+      options,
+      lib,
+      ...
+    }:
+      lib.mkIf (options ? virtualisation.memorySize) {
+        users.users.zack.password = "foo";
+      })
   ];
 
   # Bootloader.
diff --git a/modules/shell/zsh/aliases.nix b/modules/shell/zsh/aliases.nix
index 9edb243..da28c8c 100644
--- a/modules/shell/zsh/aliases.nix
+++ b/modules/shell/zsh/aliases.nix
@@ -32,6 +32,7 @@ with pkgs; {
   g = "git";
   n = "nix";
   r = "rebuild";
+  vm = "nixos-rebuild build-vm --flake ~/nixos#earth";
   mnt = "udisksctl mount -b";
   umnt = "udisksctl unmount -b";
   burn = "pkill -9";