diff --git a/mingw-w64-headers/include/ChangeLog b/mingw-w64-headers/include/ChangeLog
index 2815405..3d2e355 100755
--- a/mingw-w64-headers/include/ChangeLog
+++ b/mingw-w64-headers/include/ChangeLog
@@ -1,3 +1,8 @@
+2007-08-22  Professor Brian Ripley  <ripley@stats.ox.ac.uk>
+
+	* oleauto.h: Corrected use of NONAMELESSUNION and
+	_FORCENAMELESSUNION.
+
 2007-08-21  Kai Tietz  <kai.tietz@onevision.com>
 
 	* ctype.h: wchar.h: Add isblank () and iswblank ().
diff --git a/mingw-w64-headers/include/oleauto.h b/mingw-w64-headers/include/oleauto.h
index 39785e8..1811255 100755
--- a/mingw-w64-headers/include/oleauto.h
+++ b/mingw-w64-headers/include/oleauto.h
@@ -650,10 +650,17 @@
 WINOLEAUTAPI_(ULONG) OaBuildVersion(void);
 WINOLEAUTAPI_(void) ClearCustData(LPCUSTDATA pCustData);
 
+#if !defined(_FORCENAMELESSUNION) || defined(NONAMELESSUNION)
 #define V_UNION(X,Y) ((X)->n1.n2.n3.Y)
 #define V_VT(X) ((X)->n1.n2.vt)
 #define V_RECORDINFO(X) ((X)->n1.n2.n3.brecVal.pRecInfo)
 #define V_RECORD(X) ((X)->n1.n2.n3.brecVal.pvRecord)
+#else
+#define V_UNION(X,Y) ((X)->Y)   
+#define V_VT(X) ((X)->vt)   
+#define V_RECORDINFO(X) ((X)->pRecInfo)   
+#define V_RECORD(X) ((X)->pvRecord)   
+#endif   
 
 #define V_ISBYREF(X) (V_VT(X)&VT_BYREF)
 #define V_ISARRAY(X) (V_VT(X)&VT_ARRAY)