diff --git a/tools/ResourceUpdater/main.cpp b/tools/ResourceUpdater/main.cpp
index ca018aca7f..4b32cb8f29 100644
--- a/tools/ResourceUpdater/main.cpp
+++ b/tools/ResourceUpdater/main.cpp
@@ -586,13 +586,19 @@ bool update_infrast_data(const fs::path& input_dir, const fs::path& output_dir)
     json::value& root = old_json;
     std::unordered_set<std::string> rooms;
     for (auto& buff_obj : buffs | asst::views::values) {
-        std::string raw_room_type = static_cast<std::string>(buff_obj["roomType"]);
+        int raw_room_type = static_cast<int>(buff_obj["roomType"]);
 
         // 为了兼容老版本的字段 orz
-        static const std::unordered_map<std::string, std::string> RoomTypeMapping = {
-            { "POWER", "Power" },       { "CONTROL", "Control" }, { "DORMITORY", "Dorm" },
-            { "WORKSHOP", "" },         { "MANUFACTURE", "Mfg" }, { "TRADING", "Trade" },
-            { "MEETING", "Reception" }, { "HIRE", "Office" },     { "TRAINING", "" },
+        // static const std::unordered_map<std::string, std::string> RoomTypeMapping = {
+        //    { "POWER", "Power" },       { "CONTROL", "Control" }, { "DORMITORY", "Dorm" },
+        //    { "WORKSHOP", "" },         { "MANUFACTURE", "Mfg" }, { "TRADING", "Trade" },
+        //    { "MEETING", "Reception" }, { "HIRE", "Office" },     { "TRAINING", "" },
+        //};
+        // 2025-05-01 no longer using strings as roomType
+
+        static const std::unordered_map<int, std::string> RoomTypeMapping = {
+            { 1, "Control" }, { 2, "Power" },   { 4, "Mfg" }, { 16, "Dorm" }, { 32, "Reception" },
+            { 64, "Office" }, { 512, "Trade" }, { 1024, "" }, { 2048, "" },
         };
 
         std::string room_type = RoomTypeMapping.at(raw_room_type);