diff --git a/app/Filament/Exports/SerialValidationExporter.php b/app/Filament/Exports/SerialValidationExporter.php
index 127ad43..07d9f94 100644
--- a/app/Filament/Exports/SerialValidationExporter.php
+++ b/app/Filament/Exports/SerialValidationExporter.php
@@ -13,6 +13,7 @@ class SerialValidationExporter extends Exporter
 
     public static function getColumns(): array
     {
+        static $rowNumber = 0;
         return [
              ExportColumn::make('no')
                 ->label('NO')