diff --git a/include/boost/exception/diagnostic_information.hpp b/include/boost/exception/diagnostic_information.hpp
index c60c9af..d248b0c 100644
--- a/include/boost/exception/diagnostic_information.hpp
+++ b/include/boost/exception/diagnostic_information.hpp
@@ -17,6 +17,7 @@ boost
     namespace
     exception_detail
         {
+        inline
         char const *
         get_diagnostic_information( exception const & x )
             {