diff --git a/include/boost/functional/detail/float_functions.hpp b/include/boost/functional/detail/float_functions.hpp
index aea49f8..9de3186 100644
--- a/include/boost/functional/detail/float_functions.hpp
+++ b/include/boost/functional/detail/float_functions.hpp
@@ -25,7 +25,7 @@
 #if defined(__SGI_STL_PORT) || defined(_STLPORT_VERSION)
 #  if defined(__GNUC__) && __GNUC__ < 3 && (defined(linux) || defined(__linux) || defined(__linux__))
 #    define BOOST_HASH_USE_C99_FLOAT_FUNCS
-#  elif defined(BOOST_MSVC) && BOOST_MSVC <= 1200
+#  elif defined(BOOST_MSVC) && BOOST_MSVC < 1300
 #    define BOOST_HASH_USE_C99_FLOAT_FUNCS
 #  else
 #    define BOOST_HASH_USE_OVERLOAD_FLOAT_FUNCS