diff --git a/winsup/w32api/ChangeLog b/winsup/w32api/ChangeLog
index c8adea6be..d8eac3a35 100644
--- a/winsup/w32api/ChangeLog
+++ b/winsup/w32api/ChangeLog
@@ -1,3 +1,8 @@
+2003-05-13  Danny Smith  <dannysmith@users.sourceforge.net>
+
+	* include/prsht.h (PROPSHEETHEADER[AW]: Mark
+	anonymous unions as GCC extension.
+
 2003-05-13  Danny Smith  <dannysmith@users.sourceforge.net>
 
 	* include/oleidl.h  (LPENUMOLEDOCUMENTVIEWS): Remove typedef.
diff --git a/winsup/w32api/include/prsht.h b/winsup/w32api/include/prsht.h
index 7b5fb036b..73432dfb6 100644
--- a/winsup/w32api/include/prsht.h
+++ b/winsup/w32api/include/prsht.h
@@ -185,12 +185,12 @@ typedef struct _PROPSHEETHEADERA {
 	}DUMMYUNIONNAME3;
 	PFNPROPSHEETCALLBACK pfnCallback;
 #if (_WIN32_IE >= 0x0400)
-	union {
+	_ANONYMOUS_UNION union {
 		HBITMAP hbmWatermark;
 		LPCSTR pszbmWatermark;
 	} DUMMYUNIONNAME4;
 	HPALETTE hplWatermark;
-	union {
+	_ANONYMOUS_UNION union {
 		HBITMAP hbmHeader;
 		LPCSTR pszbmHeader;
 	} DUMMYUNIONNAME5;
@@ -218,12 +218,12 @@ typedef struct _PROPSHEETHEADERW {
 	}DUMMYUNIONNAME3;
 	PFNPROPSHEETCALLBACK pfnCallback;
 #if (_WIN32_IE >= 0x0400)
-	union {
+	_ANONYMOUS_UNION union {
 		HBITMAP hbmWatermark;
 		LPCWSTR pszbmWatermark;
 	} DUMMYUNIONNAME4;
 	HPALETTE hplWatermark;
-	union {
+	_ANONYMOUS_UNION union {
 		HBITMAP hbmHeader;
 		LPCWSTR pszbmHeader;
 	} DUMMYUNIONNAME5;