diff --git a/include/boost/format/format_class.hpp b/include/boost/format/format_class.hpp
index a7ccc29e..f9bb0ab8 100644
--- a/include/boost/format/format_class.hpp
+++ b/include/boost/format/format_class.hpp
@@ -42,7 +42,7 @@ namespace boost {
         explicit basic_format(const string_type& s);
         basic_format(const basic_format& x);
         basic_format& operator= (const basic_format& x);
-        void swap(basic_format& x);
+        void swap(basic_format& x) BOOST_NOEXCEPT_IF(BOOST_NOEXCEPT_EXPR(this->items_.swap(x.items_)));
 
 #if !defined(BOOST_NO_STD_LOCALE)
         explicit basic_format(const Ch* str, const std::locale & loc);
diff --git a/include/boost/format/format_implementation.hpp b/include/boost/format/format_implementation.hpp
index 2abb5c4b..8a70af00 100644
--- a/include/boost/format/format_implementation.hpp
+++ b/include/boost/format/format_implementation.hpp
@@ -82,7 +82,7 @@ namespace boost {
     }
     template< class Ch, class Tr, class Alloc>
     void  basic_format<Ch, Tr, Alloc>:: 
-    swap (basic_format & x) {
+    swap (basic_format & x) BOOST_NOEXCEPT_IF(BOOST_NOEXCEPT_EXPR(this->items_.swap(x.items_))) {
         std::swap(exceptions_, x.exceptions_);
         std::swap(style_, x.style_); 
         std::swap(cur_arg_, x.cur_arg_);