diff --git a/app/Http/Controllers/ProductionOrderController.php b/app/Http/Controllers/ProductionOrderController.php
index ba79e1e..ded5c1f 100644
--- a/app/Http/Controllers/ProductionOrderController.php
+++ b/app/Http/Controllers/ProductionOrderController.php
@@ -88,7 +88,7 @@ class ProductionOrderController extends Controller
             {
 
                 $serial = str_pad($i, 6, '0', STR_PAD_LEFT);
-                $serialCount = substr(str_pad($i, 6, '0', STR_PAD_LEFT), -5);
+                $serialCount = substr(str_pad($i, 6, '0', STR_PAD_LEFT), -6);
 
                 $qrData = $plantCode . '/' . $itemCode . '/' . $year.$month . '/' . $serialCount;