diff --git a/include/boost/format/format_class.hpp b/include/boost/format/format_class.hpp
index a7ccc29e..b68a97e9 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) noexcept;
 
 #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..05a332ff 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) noexcept {
         std::swap(exceptions_, x.exceptions_);
         std::swap(style_, x.style_); 
         std::swap(cur_arg_, x.cur_arg_);