diff --git a/hosts/asuka/soryu/configuration.nix b/hosts/asuka/soryu/configuration.nix
index 6400817..3654eff 100644
--- a/hosts/asuka/soryu/configuration.nix
+++ b/hosts/asuka/soryu/configuration.nix
@@ -9,6 +9,7 @@
     [ # Include the results of the hardware scan.
       ./hardware-configuration.nix
 #      ./wack.nix
+      ../../common/builder.nix
     ];
 
 
diff --git a/hosts/common/builder.nix b/hosts/common/builder.nix
new file mode 100644
index 0000000..bd87491
--- /dev/null
+++ b/hosts/common/builder.nix
@@ -0,0 +1,15 @@
+{ config, lib, pkgs, ... }:
+
+{
+  users.users.nixbuilder = {
+    isSystemUser = true;
+    useDefaultShell = true;
+    openssh.authorizedKeys.keys = [
+      "ssh-rsa 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 root@DanixLaptop"
+    ];
+  };
+
+  nix.settings.trusted-users = [ "nixbuilder" ];
+
+  boot.binfmt.emulatedSystems = [ "aarch64-linux" ];
+}