diff --git a/app/Http/Controllers/RoomControlController.php b/app/Http/Controllers/RoomControlController.php
index 53d3486..9403583 100644
--- a/app/Http/Controllers/RoomControlController.php
+++ b/app/Http/Controllers/RoomControlController.php
@@ -289,7 +289,7 @@ class RoomControlController extends Controller
         $roomType = null;
         $roomName = null;
         // 從 room_name（例如 PC101, SVR01）中擷取 type 與 name
-        if (preg_match('/^([A-Za-z]+)(\d+)$/', $validated['hostname'], $matches)) {
+        if (preg_match('/^([A-Za-z]+)(\d+)$/', $validated['room_name'], $matches)) {
             $roomType = strtolower($matches[1]); // 'PC' → 'pc'
             $roomName = $matches[2];             // '101'
         }