diff --git a/include/boost/type_index/stl_type_index.hpp b/include/boost/type_index/stl_type_index.hpp
index a5add88..be28889 100644
--- a/include/boost/type_index/stl_type_index.hpp
+++ b/include/boost/type_index/stl_type_index.hpp
@@ -1,5 +1,5 @@
 //
-// Copyright (c) Antony Polukhin, 2013-2015.
+// Copyright (c) Antony Polukhin, 2013-2017.
 //
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
@@ -174,7 +174,7 @@ inline std::string stl_type_index::pretty_name() const {
 
 
 inline std::size_t stl_type_index::hash_code() const BOOST_NOEXCEPT {
-#if _MSC_VER > 1600 || (__GNUC__ == 4 && __GNUC_MINOR__ > 5 && defined(__GXX_EXPERIMENTAL_CXX0X__))
+#if (defined(_MSC_VER) && _MSC_VER > 1600) || (__GNUC__ == 4 && __GNUC_MINOR__ > 5 && defined(__GXX_EXPERIMENTAL_CXX0X__))
     return data_->hash_code();
 #else
     return boost::hash_range(raw_name(), raw_name() + std::strlen(raw_name()));