diff --git a/winsup/w32api/ChangeLog b/winsup/w32api/ChangeLog
index b0ac042a5..eb7e7e4d7 100644
--- a/winsup/w32api/ChangeLog
+++ b/winsup/w32api/ChangeLog
@@ -1,3 +1,7 @@
+2006-04-28  Dimitri Papadopoulos  <papadopo@users.sourceforge.net>
+
+	* include/basetyps.h (REFFMTID): Define properly.
+
 2006-04-28  Dimitri Papadopoulos  <papadopo@users.sourceforge.net>
 
 	* include/winnt.h (WT_SET_MAX_THREADPOOL_THREADS): Define.
diff --git a/winsup/w32api/include/basetyps.h b/winsup/w32api/include/basetyps.h
index d5e18bce0..ac6015381 100644
--- a/winsup/w32api/include/basetyps.h
+++ b/winsup/w32api/include/basetyps.h
@@ -134,14 +134,17 @@ typedef unsigned long PROPID;
 #define REFGUID const GUID&
 #define REFIID const IID&
 #define REFCLSID const CLSID&
+#define REFFMTID const FMTID&
 #else
 #define REFGUID const GUID* const
 #define REFIID const IID* const
 #define REFCLSID const CLSID* const
+#define REFFMTID const FMTID* const
 #endif
 #define _REFGUID_DEFINED
 #define _REFIID_DEFINED
 #define _REFCLSID_DEFINED
+#define _REFFMTID_DEFINED
 #endif
 #ifndef GUID_SECTION
 #define GUID_SECTION ".text"