diff --git a/app/controller/api/UserController.php b/app/controller/api/UserController.php
index b03764d..298a8ce 100644
--- a/app/controller/api/UserController.php
+++ b/app/controller/api/UserController.php
@@ -123,7 +123,7 @@ class UserController
         $user->join_ip = $request->getRealIp($safe_mode = true);
         $user->f_id = $f_id;
         $user->ff_id = $ff_id;
-        $user->invite_code = Random::str_random(5);
+        $user->invite_code = Random::str_random(5,7);
         $user->password = password_hash($password, PASSWORD_DEFAULT);
         $user->save();
         $user_new = User::where('username', $username)->first();