diff --git a/mingw-w64-headers/include/ChangeLog b/mingw-w64-headers/include/ChangeLog
index d14ba83..95789e2 100644
--- a/mingw-w64-headers/include/ChangeLog
+++ b/mingw-w64-headers/include/ChangeLog
@@ -1,3 +1,7 @@
+2011-01-17  Jonathan Yong  <jon_y@users.sourceforge.net>
+
+	* winuser.h (WM_MOUSEHWHEEL): Define.
+
 2011-01-14  Ozkan Sezer  <sezeroz@gmail.com>
 
 	* winsplp.h (MONITOR2): Fixes according to msdn documentation at
diff --git a/mingw-w64-headers/include/winuser.h b/mingw-w64-headers/include/winuser.h
index bd37264..d17e6e5 100644
--- a/mingw-w64-headers/include/winuser.h
+++ b/mingw-w64-headers/include/winuser.h
@@ -1115,6 +1115,10 @@
 #define WM_XBUTTONDBLCLK 0x020D
 #define WM_MOUSELAST 0x020D
 
+#if (_WIN32_WINNT >= 0x0600)
+#define WM_MOUSEHWHEEL 0x020E
+#endif
+
 #define WHEEL_DELTA 120
 #define GET_WHEEL_DELTA_WPARAM(wParam) ((short)HIWORD(wParam))