diff --git a/app/Http/Controllers/InvoiceController.php b/app/Http/Controllers/InvoiceController.php
index 8da96f12..e3b94c3c 100644
--- a/app/Http/Controllers/InvoiceController.php
+++ b/app/Http/Controllers/InvoiceController.php
@@ -65,6 +65,7 @@ class InvoiceController extends Controller
             'contact_no' => 'required',
             'marking' => 'required',
             'reg_no' => 'required',
+            'adjustment' => 'required|numeric',
             'lines.*.order' => 'required|numeric',
             'lines.*.stock_code' => 'required',
             'lines.*.description' => 'max:256',
@@ -174,6 +175,7 @@ class InvoiceController extends Controller
             'contact_no' => 'required',
             'marking' => 'required',
             'reg_no' => 'required',
+            'adjustment' => 'required|numeric',
             'lines.*.order' => 'required|numeric',
             'lines.*.stock_code' => 'required',
             'lines.*.description' => 'max:256',