diff --git a/include/fs/archive_ext_save_data.hpp b/include/fs/archive_ext_save_data.hpp
index 614aaf30..05a04682 100644
--- a/include/fs/archive_ext_save_data.hpp
+++ b/include/fs/archive_ext_save_data.hpp
@@ -1,4 +1,5 @@
 #pragma once
+#include <unordered_map>
 #include "archive_base.hpp"
 
 #pragma pack(push, 1)