diff --git a/app/Http/Controllers/MachineController.php b/app/Http/Controllers/MachineController.php
index 556db7d..a7a2b63 100644
--- a/app/Http/Controllers/MachineController.php
+++ b/app/Http/Controllers/MachineController.php
@@ -158,7 +158,7 @@ class MachineController extends Controller
             $test[] = [
             'group_work_center' => WorkGroupMaster::where('id', $curWorkGroupId)->first()->name ?? "",
             'operation_number' => WorkGroupMaster::where('id', $curWorkGroupId)->first()->operation_number ?? "",
-            'work_centers' => Machine::where('plant_id', $plantId)->where('work_group_master_id', $curWorkGroupId)->pluck('work_center')->toArray() ?? [],
+            'work_centers' => Machine::where('plant_id', $plantId)->where('work_group_master_id', $curWorkGroupId)->orderBy('work_center')->pluck('work_center')->toArray() ?? [],
             ];
         }