diff --git a/include/boost/regex/config.hpp b/include/boost/regex/config.hpp
index 5022bbde..1b9e746d 100644
--- a/include/boost/regex/config.hpp
+++ b/include/boost/regex/config.hpp
@@ -195,7 +195,7 @@ using std::distance;
  ****************************************************************************/
 
 #ifdef __cplusplus
-#if defined(BOOST_MSVC) && (BOOST_MSVC >= 1300) && !defined(BOOST_REGEX_V3)
+#if defined(BOOST_MSVC) && (BOOST_MSVC >= 1300) && !defined(BOOST_REGEX_V3) && !(defined(__SGI_STL_PORT) || defined(_STLPORT_VERSION))
 #  define BOOST_REGEX_HAS_SHORT_WCHAR_T
 namespace boost{ typedef __wchar_t regex_wchar_type; }
 #else