diff --git a/src/MaaCore/Task/Fight/StageDropsTaskPlugin.cpp b/src/MaaCore/Task/Fight/StageDropsTaskPlugin.cpp
index b2013abf38..a137f11079 100644
--- a/src/MaaCore/Task/Fight/StageDropsTaskPlugin.cpp
+++ b/src/MaaCore/Task/Fight/StageDropsTaskPlugin.cpp
@@ -112,6 +112,8 @@ bool asst::StageDropsTaskPlugin::recognize_drops()
 
     auto&& [code, difficulty] = analyzer.get_stage_key();
     m_stage_code = std::move(code);
+    ranges::transform(m_stage_code, m_stage_code.begin(),
+                      [](char ch) -> char { return static_cast<char>(::toupper(ch)); });
     m_stage_difficulty = difficulty;
     m_stars = analyzer.get_stars();
     m_cur_drops = analyzer.get_drops();