diff --git a/reactos/lib/3rdparty/stlport/src/stdio_streambuf.cpp b/reactos/lib/3rdparty/stlport/src/stdio_streambuf.cpp
index 45aad790a6c..d49e10ad287 100644
--- a/reactos/lib/3rdparty/stlport/src/stdio_streambuf.cpp
+++ b/reactos/lib/3rdparty/stlport/src/stdio_streambuf.cpp
@@ -34,7 +34,7 @@ _STLP_MOVE_TO_PRIV_NAMESPACE
 
 #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