diff --git a/include/boost/type_traits/is_signed.hpp b/include/boost/type_traits/is_signed.hpp
index e06b47c..bf7bbfd 100644
--- a/include/boost/type_traits/is_signed.hpp
+++ b/include/boost/type_traits/is_signed.hpp
@@ -26,11 +26,19 @@ namespace detail{
 
 #if !(defined(__EDG_VERSION__) && __EDG_VERSION__ <= 238)
 
+template <class T>
+struct is_signed_values
+{
+   typedef typename remove_cv<T>::type no_cv_t;
+   BOOST_STATIC_CONSTANT(no_cv_t, minus_one = (static_cast<no_cv_t>(-1)));
+   BOOST_STATIC_CONSTANT(no_cv_t, zero = (static_cast<no_cv_t>(0)));
+};
+
 template <class T>
 struct is_signed_helper
 {
    typedef typename remove_cv<T>::type no_cv_t;
-   BOOST_STATIC_CONSTANT(bool, value = (!(static_cast<no_cv_t>(-1) > 0)));
+   BOOST_STATIC_CONSTANT(bool, value = (!(::boost::detail::is_signed_values<T>::minus_one  > boost::detail::is_signed_values<T>::zero)));
 };
 
 template <bool integral_type>
diff --git a/include/boost/type_traits/is_unsigned.hpp b/include/boost/type_traits/is_unsigned.hpp
index 4866486..98baf4e 100644
--- a/include/boost/type_traits/is_unsigned.hpp
+++ b/include/boost/type_traits/is_unsigned.hpp
@@ -27,10 +27,17 @@ namespace detail{
 #if !(defined(__EDG_VERSION__) && __EDG_VERSION__ <= 238)
 
 template <class T>
-struct is_ununsigned_helper
+struct is_unsigned_values
 {
    typedef typename remove_cv<T>::type no_cv_t;
-   BOOST_STATIC_CONSTANT(bool, value = (static_cast<no_cv_t>(-1) > 0));
+   BOOST_STATIC_CONSTANT(no_cv_t, minus_one = (static_cast<no_cv_t>(-1)));
+   BOOST_STATIC_CONSTANT(no_cv_t, zero = (static_cast<no_cv_t>(0)));
+};
+
+template <class T>
+struct is_ununsigned_helper
+{
+   BOOST_STATIC_CONSTANT(bool, value = (::boost::detail::is_unsigned_values<T>::minus_one > ::boost::detail::is_unsigned_values<T>::zero));
 };
 
 template <bool integral_type>
diff --git a/test/is_abstract_test.cpp b/test/is_abstract_test.cpp
old mode 100755
new mode 100644
index 2d2079a..3f63aee
--- a/test/is_abstract_test.cpp
+++ b/test/is_abstract_test.cpp
@@ -13,6 +13,10 @@
 #  include <boost/type_traits/is_abstract.hpp>
 #endif
 
+#ifdef BOOST_MSVC
+#pragma warning(disable: 4505)
+#endif
+
 
 struct TestA {};
 struct TestB { virtual void foo(void) = 0; };
diff --git a/test/test.hpp b/test/test.hpp
index 47c3333..f31452b 100644
--- a/test/test.hpp
+++ b/test/test.hpp
@@ -407,6 +407,10 @@ struct wrap
 {
    T t;
    int j;
+protected:
+   wrap();
+   wrap(const wrap&);
+   wrap& operator=(const wrap&);
 };