diff --git a/include/boost/exception/info.hpp b/include/boost/exception/info.hpp
index 86d558b..3fd6681 100644
--- a/include/boost/exception/info.hpp
+++ b/include/boost/exception/info.hpp
@@ -31,7 +31,7 @@ boost
     template <class Tag,class T>
     inline
     std::string
-    error_info_name( error_info<Tag,T> const & x )
+    error_info_name( error_info<Tag,T> const & )
         {
         return tag_type_name<Tag>();
         }