diff --git a/include/boost/exception/to_string.hpp b/include/boost/exception/to_string.hpp
index 59bf83d..0331e1f 100644
--- a/include/boost/exception/to_string.hpp
+++ b/include/boost/exception/to_string.hpp
@@ -19,11 +19,16 @@
 namespace
 boost
     {
+    template <class T,class U>
+    std::string to_string( std::pair<T,U> const & );
+    std::string to_string( std::exception const & );
+
     namespace
     to_string_detail
         {
         template <class T>
         typename disable_if<is_output_streamable<T>,char>::type to_string( T const & );
+        using boost::to_string;
 
         template <class,bool IsOutputStreamable>
         struct has_to_string_impl;
diff --git a/include/boost/exception/to_string_stub.hpp b/include/boost/exception/to_string_stub.hpp
index e41d369..c32a4c9 100644
--- a/include/boost/exception/to_string_stub.hpp
+++ b/include/boost/exception/to_string_stub.hpp
@@ -101,6 +101,14 @@ boost
         {
         return exception_detail::to_string_dispatch::dispatch(x,s);
         }
+
+    template <class T,class U,class Stub>
+    inline
+    std::string
+    to_string_stub( std::pair<T,U> const & x, Stub s )
+        {
+        return std::string("(") + to_string_stub(x.first,s) + ',' + to_string_stub(x.second,s) + ')';
+        }
     }
 
 #if defined(_MSC_VER) && !defined(BOOST_EXCEPTION_ENABLE_WARNINGS)