diff --git a/winsup/w32api/ChangeLog b/winsup/w32api/ChangeLog
index f4f3753e9..c56bf2f47 100644
--- a/winsup/w32api/ChangeLog
+++ b/winsup/w32api/ChangeLog
@@ -1,3 +1,7 @@
+2007-11-21  Brian Dessent <dessent@users.sourceforge.net>
+
+	* include/winbase.h (CheckTokenMembership): define.
+
 2007-10-03  Jiri Malak  <Jiri.Malak@iol.cz>
 
 	* include/rpcndr.h: Missing NdrClientCall2 entry.
diff --git a/winsup/w32api/include/winbase.h b/winsup/w32api/include/winbase.h
index 5a77471d6..16f7fcbfb 100644
--- a/winsup/w32api/include/winbase.h
+++ b/winsup/w32api/include/winbase.h
@@ -1161,6 +1161,9 @@ WINBASEAPI BOOL WINAPI CheckNameLegalDOS8Dot3A(LPCSTR,LPSTR,DWORD,PBOOL,PBOOL);
 WINBASEAPI BOOL WINAPI CheckNameLegalDOS8Dot3W(LPCWSTR,LPSTR,DWORD,PBOOL,PBOOL);
 WINBASEAPI BOOL WINAPI CheckRemoteDebuggerPresent(HANDLE,PBOOL);
 #endif
+#if (_WIN32_WINNT >= 0x0500)
+WINBASEAPI BOOL WINAPI CheckTokenMembership(HANDLE,PSID,PBOOL);
+#endif
 WINBASEAPI BOOL WINAPI ClearCommBreak(HANDLE);
 WINBASEAPI BOOL WINAPI ClearCommError(HANDLE,PDWORD,LPCOMSTAT);
 WINBASEAPI BOOL WINAPI ClearEventLogA(HANDLE,LPCSTR);