#if defined (_STLP_USE_DEFAULT_FILE_OFFSET) || \
(!defined(_LARGEFILE_SOURCE) && !defined(_LARGEFILE64_SOURCE))
-# if !defined (_STLP_MSVC) || (_STLP_MSVC < 1400) || defined(_STLP_WCE)
+# if !defined (_STLP_MSVC) || (_STLP_MSVC < 1400) || defined(_STLP_WCE) || defined(__REACTOS__)
# define FSEEK fseek
# else
# define FSEEK _fseeki64