diff --git a/include/boost/regex.hpp b/include/boost/regex.hpp
index 379024c0..0f258507 100644
--- a/include/boost/regex.hpp
+++ b/include/boost/regex.hpp
@@ -838,7 +838,7 @@ public:
    typedef Allocator                                                 alloc_type;
    typedef BOOST_RE_MAYBE_TYPENAME REBIND_TYPE(iterator, Allocator)  iterator_alloc;
    typedef typename iterator_alloc::size_type                        size_type;
-#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) && !defined(BOOST_NO_STD_ITERATOR_TRAITS)
    typedef typename std::iterator_traits<iterator>::difference_type  difference_type;
    typedef typename std::iterator_traits<iterator>::value_type       char_type;
 #else