diff --git a/include/boost/functional/detail/hash_float.hpp b/include/boost/functional/detail/hash_float.hpp
index ecb48cd..1811efe 100644
--- a/include/boost/functional/detail/hash_float.hpp
+++ b/include/boost/functional/detail/hash_float.hpp
@@ -20,7 +20,7 @@
 #include <boost/assert.hpp>
 #include <errno.h>
 
-#if (defined(_WIN32) || defined(__WIN32__) || defined(WIN32)) && !defined(__DMC__)
+#if defined(BOOST_MSVC)
 #  define BOOST_HASH_USE_FPCLASS
 #elif (defined(__GLIBCPP__) || defined(__GLIBCXX__)) \
     && (defined(__USE_ISOC99) || defined(_GLIBCXX_USE_C99_MATH))