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-rw-r--r--win/upgrade_wizard/stdafx.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/win/upgrade_wizard/stdafx.h b/win/upgrade_wizard/stdafx.h
index 55f9e71ed70..86e4fd826de 100644
--- a/win/upgrade_wizard/stdafx.h
+++ b/win/upgrade_wizard/stdafx.h
@@ -14,7 +14,7 @@
#endif
#include "targetver.h"
-
+struct IUnknown;
#define _ATL_CSTRING_EXPLICIT_CONSTRUCTORS // some CString constructors will be explicit
// turns off MFC's hiding of some common and often safely ignored warning messages