diff --git a/winsup/w32api/ChangeLog b/winsup/w32api/ChangeLog
index 471798955..1b66997d2 100644
--- a/winsup/w32api/ChangeLog
+++ b/winsup/w32api/ChangeLog
@@ -1,3 +1,8 @@
+2011-03-05  Chris Sutcliffe  <ir0nh34d@users.sourceforge.net>
+
+	* include/wtsapi32.h (WTSSendMessageA, WTSSendMessageW, WTSSendMessage):
+	Define.
+
 2011-03-05  Chris Sutcliffe  <ir0nh34d@users.sourceforge.net>
 
 	* include/winbase.h (PSAPI_WORKING_SET_BLOCK,
diff --git a/winsup/w32api/include/wtsapi32.h b/winsup/w32api/include/wtsapi32.h
index f9f180270..5bd09bbbd 100644
--- a/winsup/w32api/include/wtsapi32.h
+++ b/winsup/w32api/include/wtsapi32.h
@@ -136,6 +136,38 @@ void WINAPI WTSFreeMemory(PVOID pMemory);
 #define WTSQuerySessionInformation WTSQuerySessionInformationA
 #endif
 
+BOOL WTSSendMessageA(
+  HANDLE hServer,
+  DWORD SessionId,
+  LPSTR pTitle,
+  DWORD TitleLength,
+  LPSTR pMessage,
+  DWORD MessageLength,
+  DWORD Style,
+  DWORD Timeout,
+  DWORD *pResponse,
+  BOOL bWait
+);
+
+BOOL WTSSendMessageW(
+  HANDLE hServer,
+  DWORD SessionId,
+  LPWSTR pTitle,
+  DWORD TitleLength,
+  LPWSTR pMessage,
+  DWORD MessageLength,
+  DWORD Style,
+  DWORD Timeout,
+  DWORD *pResponse,
+  BOOL bWait
+);
+
+#ifdef UNICODE
+#define WTSSendMessage WTSSendMessageW
+#else
+#define WTSSendMessage WTSSendMessageA
+#endif
+
 #endif /* _WIN32_WINNT >= 0x0500 */
 
 #ifdef __cplusplus