diff --git a/CPP/7zip/UI/Common/ArchiveExtractCallback.h b/CPP/7zip/UI/Common/ArchiveExtractCallback.h
index 41e34258..cc385732 100755
--- a/CPP/7zip/UI/Common/ArchiveExtractCallback.h
+++ b/CPP/7zip/UI/Common/ArchiveExtractCallback.h
@@ -437,6 +437,8 @@ public:
   
   FString DirPathPrefix_for_HashFiles;
 
+  Int64 SoleFolderIndex;
+
   CArchiveExtractCallback();
 
   void InitForMulti(bool multiArchives,