diff --git a/include/winbase.h b/include/winbase.h
index baf0f264c1cf850d404e257d2d2e0f5bb3c07660..ffbc87f18c983ca329429ce417b60693f42f29ff 100644
--- a/include/winbase.h
+++ b/include/winbase.h
@@ -1301,6 +1301,7 @@ HANDLE      WINAPI CreateWaitableTimerW(LPSECURITY_ATTRIBUTES,BOOL,LPCWSTR);
 BOOL        WINAPI DebugActiveProcess(DWORD);
 void        WINAPI DebugBreak(void);
 BOOL        WINAPI DeregisterEventSource(HANDLE);
+BOOL        WINAPI DeviceIoControl(HANDLE,DWORD,LPVOID,DWORD,LPVOID,DWORD,LPDWORD,LPOVERLAPPED);
 BOOL        WINAPI DisableThreadLibraryCalls(HMODULE);
 BOOL        WINAPI DosDateTimeToFileTime(WORD,WORD,LPFILETIME);
 BOOL        WINAPI DuplicateHandle(HANDLE,HANDLE,HANDLE,HANDLE*,DWORD,BOOL,DWORD);