diff --git a/include/boost/unordered/detail/allocator_helpers.hpp b/include/boost/unordered/detail/allocator_helpers.hpp
index 6b59aec3..c4da2e68 100644
--- a/include/boost/unordered/detail/allocator_helpers.hpp
+++ b/include/boost/unordered/detail/allocator_helpers.hpp
@@ -27,17 +27,13 @@
 #include <boost/utility/addressof.hpp>
 
 #if !defined(BOOST_UNORDERED_USE_ALLOCATOR_TRAITS)
-// An allocator_traits test is currently failing for gcc 4.7 on mingw. I think
-// this is because it's an older development version. Temporarily disabling
-// std::allocator_traits in order ot get clean test results. Will reactivate
-// later.
 
-/*
 #   if defined(__GXX_EXPERIMENTAL_CXX0X__) && \
             (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))
 #       define BOOST_UNORDERED_USE_ALLOCATOR_TRAITS 1
+#   elif BOOST_MSVC >= 1700 && defined(_CPPLIB_VER)
+#       define BOOST_UNORDERED_USE_ALLOCATOR_TRAITS 1
 #   endif
-*/
 
 // Use container's allocator_traits for older versions of Visual C++ as I don't
 // test with them.