Index: v4/basic_regex.hpp
===================================================================
--- v4/basic_regex.hpp	(revision 42336)
+++ v4/basic_regex.hpp	(revision 42366)
@@ -36,8 +36,11 @@
 namespace boost{
 #ifdef BOOST_MSVC
 #pragma warning(push)
-#pragma warning(disable : 4251 4231 4660 4800)
+#pragma warning(disable : 4251 4231 4800)
+#if (BOOST_MSVC < 1600)
+#pragma warning(disable : 4660)
 #endif
+#endif
 
 namespace re_detail{
 
Index: v4/match_results.hpp
===================================================================
--- v4/match_results.hpp	(revision 42336)
+++ v4/match_results.hpp	(revision 42366)
@@ -33,8 +33,11 @@
 namespace boost{
 #ifdef BOOST_MSVC
 #pragma warning(push)
-#pragma warning(disable : 4251 4231 4660)
+#pragma warning(disable : 4251 4231)
+#if (BOOST_MSVC < 1600)
+#pragma warning(disable : 4660)
 #endif
+#endif
 
 namespace re_detail{
 
Index: v4/instances.hpp
===================================================================
--- v4/instances.hpp	(revision 42336)
+++ v4/instances.hpp	(revision 42366)
@@ -84,7 +84,10 @@
 
 #  ifdef BOOST_MSVC
 #     pragma warning(push)
-#     pragma warning(disable : 4251 4231 4660)
+#     pragma warning(disable : 4251 4231)
+#     if (BOOST_MSVC < 1600)
+#        pragma warning(disable : 4660)
+#     endif
 #  endif
 
 template class BOOST_REGEX_TEMPLATE_DECL basic_regex< BOOST_REGEX_CHAR_T BOOST_REGEX_TRAITS_T >;
Index: v4/perl_matcher.hpp
===================================================================
--- v4/perl_matcher.hpp	(revision 42336)
+++ v4/perl_matcher.hpp	(revision 42366)
@@ -344,8 +344,11 @@
 
 #ifdef BOOST_MSVC
 #pragma warning(push)
-#pragma warning(disable : 4251 4231 4660)
+#pragma warning(disable : 4251 4231)
+#if (BOOST_MSVC < 1600)
+#pragma warning(disable : 4660)
 #endif
+#endif
 
 template <class BidiIterator, class Allocator, class traits>
 class perl_matcher
Index: config.hpp
===================================================================
--- config.hpp	(revision 42336)
+++ config.hpp	(revision 42366)
@@ -170,7 +170,10 @@
 #  define BOOST_REGEX_HAS_OTHER_WCHAR_T
 #  ifdef BOOST_MSVC
 #     pragma warning(push)
-#     pragma warning(disable : 4251 4231 4660)
+#     pragma warning(disable : 4251 4231)
+#     if (BOOST_MSVC < 1600)
+#        pragma warning(disable : 4660)
+#     endif
 #  endif
 #  if defined(_DLL) && defined(BOOST_MSVC) && (BOOST_MSVC < 1600)
 #     include <string>