diff --git a/include/boost/type_traits/is_member_pointer.hpp b/include/boost/type_traits/is_member_pointer.hpp
index b26436f..2a77c6d 100644
--- a/include/boost/type_traits/is_member_pointer.hpp
+++ b/include/boost/type_traits/is_member_pointer.hpp
@@ -53,7 +53,7 @@ BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_2(typename T,typename U,is_member_pointer,
 namespace detail {
 
 template <typename R, typename T>
-::boost::type_traits::yes_type BOOST_TT_DECL is_member_pointer_tester(R T::**);
+::boost::type_traits::yes_type BOOST_TT_DECL is_member_pointer_tester(R T::*const volatile*);
 ::boost::type_traits::no_type BOOST_TT_DECL is_member_pointer_tester(...);
 
 template <bool>