diff --git a/app/Http/Controllers/API/Auth/RegisterController.php b/app/Http/Controllers/API/Auth/RegisterController.php
index fee326df..219816cd 100644
--- a/app/Http/Controllers/API/Auth/RegisterController.php
+++ b/app/Http/Controllers/API/Auth/RegisterController.php
@@ -65,7 +65,7 @@ public function register(Request $request)
                 'last_name' => 'required|string|max:255',
                 'email' => 'required|string|email|max:255|unique:users',
                 'password' => 'required|string|min:8',
-                'username' => 'required|string',
+                'username' => 'required|string|max:255|unique:users',
             ]);
 
         if ($validateUser->fails()) {