diff --git a/include/boost/regex/v4/cpp_regex_traits.hpp b/include/boost/regex/v4/cpp_regex_traits.hpp
index dbec293c..ddcbef43 100644
--- a/include/boost/regex/v4/cpp_regex_traits.hpp
+++ b/include/boost/regex/v4/cpp_regex_traits.hpp
@@ -128,7 +128,7 @@ parser_buf<charT, traits>::seekoff(off_type off, ::std::ios_base::seekdir way, :
       break;
    case ::std::ios_base::cur:
    {
-      std::ptrdiff_t newpos = pos + off;
+      std::ptrdiff_t newpos = static_cast<std::ptrdiff_t>(pos + off);
       if((newpos < 0) || (newpos > size))
          return pos_type(off_type(-1));
       else
diff --git a/include/boost/regex/v4/regex_workaround.hpp b/include/boost/regex/v4/regex_workaround.hpp
index 917320ca..fc3c2123 100644
--- a/include/boost/regex/v4/regex_workaround.hpp
+++ b/include/boost/regex/v4/regex_workaround.hpp
@@ -150,13 +150,16 @@ namespace boost{ namespace re_detail{
       return stdext::unchecked_equal(first, last, with);
    }
 
+#else 
+   using std::copy; 
+   using std::equal; 
+#endif 
+#if BOOST_WORKAROUND(BOOST_MSVC,>=1400) && defined(__STDC_WANT_SECURE_LIB__) && __STDC_WANT_SECURE_LIB__ 
+
    // use safe versions of strcpy etc:
    using ::strcpy_s;
    using ::strcat_s;
 #else
-   using std::copy;
-   using std::equal;
-
    inline std::size_t strcpy_s(
       char *strDestination,
       std::size_t sizeInBytes,