diff --git a/helpers.nix b/helpers.nix
index 5752db1..d953517 100644
--- a/helpers.nix
+++ b/helpers.nix
@@ -100,10 +100,12 @@ with inputs.nixpkgs.lib; {
   }: let
     pkgs = import nixpkgs {
       system = "aarch64-linux";
-      config.allowUnfree = true;
-      overlays = [
-        nix-on-droid.overlays.default
-      ];
+      config = {
+        allowUnfree = true;
+        overlays = [
+          nix-on-droid.overlays.default
+        ];
+      };
     };
 
     activateNixOnDroid = configuration:
@@ -114,12 +116,10 @@ with inputs.nixpkgs.lib; {
     nixOnDroidConfigurations.${hostname} = nix-on-droid.lib.nixOnDroidConfiguration {
       inherit pkgs;
 
+      extraSpecialArgs = {inherit uid gid;};
+
       modules = [
         ./suites/nix-on-droid
-        {
-          user.uid = uid;
-          user.gid = gid;
-        }
       ];
     };
 
diff --git a/suites/nix-on-droid/default.nix b/suites/nix-on-droid/default.nix
index 69c7ff6..ad6103a 100644
--- a/suites/nix-on-droid/default.nix
+++ b/suites/nix-on-droid/default.nix
@@ -2,6 +2,8 @@
   config,
   pkgs,
   lib,
+  uid,
+  gid,
   ...
 }:
 with lib; let
@@ -17,6 +19,12 @@ with lib; let
     ${pkgs.openssh}/bin/sshd -f "${sshdDirectory}/sshd_config" -D
   '';
 in {
+  # Set UID & GID
+  user = {
+    uid = uid;
+    gid = gid;
+  };
+
   # NixOS version.
   system.stateVersion = "24.05";
 
@@ -28,7 +36,7 @@ in {
   # SSHD script.
   build.activation.sshd = ''
     $DRY_RUN_CMD mkdir $VERBOSE_ARG --parents "${config.user.home}/.ssh"
-    $DRY_RUN_CMD cat ${authorizedKeys} > "${config.user.home}/.ssh/authorized_keys"
+    $DRY_RUN_CMD echo ${authorizedKeys} > "${config.user.home}/.ssh/authorized_keys"
 
     if [[ ! -d "${sshdDirectory}" ]]; then
       $DRY_RUN_CMD rm $VERBOSE_ARG --recursive --force "${sshdTmpDirectory}"