diff --git a/include/boost/smart_ptr/bad_weak_ptr.hpp b/include/boost/smart_ptr/bad_weak_ptr.hpp
index b086be5..e3e81f9 100644
--- a/include/boost/smart_ptr/bad_weak_ptr.hpp
+++ b/include/boost/smart_ptr/bad_weak_ptr.hpp
@@ -47,7 +47,7 @@ class bad_weak_ptr: public std::exception
 {
 public:
 
-    virtual char const * what() const throw()
+    virtual char const * what() const BOOST_NOEXCEPT_OR_NOTHROW
     {
         return "tr1::bad_weak_ptr";
     }