diff --git a/winsup/w32api/ChangeLog b/winsup/w32api/ChangeLog
index c5f301cd8..967796888 100644
--- a/winsup/w32api/ChangeLog
+++ b/winsup/w32api/ChangeLog
@@ -1,3 +1,8 @@
+2011-03-04  Seth Jackson  <sethj@users.sourceforge.net>
+
+	* include/winnt.h (PAGE_WRITECOMBINE): Define.
+	* include/winbase.h (THREAD_MODE_BACKGROUND_BEGIN, THREAD_MODE_BACKGROUND_END): Define.
+
 2011-03-04  Chris Sutcliffe  <ir0nh34d@users.sourceforge.net>
 
 	* include/winbase.h (__MINGW_EXTENSION): Define.
diff --git a/winsup/w32api/include/winbase.h b/winsup/w32api/include/winbase.h
index 18f1b7e56..dfe2aa15d 100644
--- a/winsup/w32api/include/winbase.h
+++ b/winsup/w32api/include/winbase.h
@@ -270,6 +270,10 @@ extern "C" {
 #define GET_TAPE_DRIVE_INFORMATION 1
 #define SET_TAPE_MEDIA_INFORMATION 0
 #define SET_TAPE_DRIVE_INFORMATION 1
+#if (_WIN32_WINNT >= 0x0600)
+#define THREAD_MODE_BACKGROUND_BEGIN 0x00010000
+#define THREAD_MODE_BACKGROUND_END 0x00020000
+#endif
 #define THREAD_PRIORITY_ABOVE_NORMAL 1
 #define THREAD_PRIORITY_BELOW_NORMAL (-1)
 #define THREAD_PRIORITY_HIGHEST 2
diff --git a/winsup/w32api/include/winnt.h b/winsup/w32api/include/winnt.h
index 9a36660bb..dd89726cf 100644
--- a/winsup/w32api/include/winnt.h
+++ b/winsup/w32api/include/winnt.h
@@ -1041,6 +1041,7 @@ typedef DWORD FLONG;
 #define PAGE_EXECUTE_WRITECOPY	0x0080
 #define PAGE_GUARD		0x0100
 #define PAGE_NOCACHE		0x0200
+#define PAGE_WRITECOMBINE 0x0400
 #define MEM_COMMIT           0x1000
 #define MEM_RESERVE          0x2000
 #define MEM_DECOMMIT         0x4000