diff --git a/contrib/epee/include/serialization/keyvalue_serialization_overloads.h b/contrib/epee/include/serialization/keyvalue_serialization_overloads.h
index 7087136cc..09087f785 100644
--- a/contrib/epee/include/serialization/keyvalue_serialization_overloads.h
+++ b/contrib/epee/include/serialization/keyvalue_serialization_overloads.h
@@ -156,7 +156,7 @@ namespace epee
         typename stl_container::value_type* pelem =  (typename stl_container::value_type*)buff.data();
         CHECK_AND_ASSERT_MES(!(loaded_size%sizeof(typename stl_container::value_type)), 
           false, 
-          "size in blob " << loaded_size << " not have not zero modulo for sizeof(value_type) = " << sizeof(typename stl_container::value_type));
+          "size in blob " << loaded_size << " not have not zero modulo for sizeof(value_type) = " << sizeof(typename stl_container::value_type) << ", type " << typeid(typename stl_container::value_type).name());
         size_t count = (loaded_size/sizeof(typename stl_container::value_type));
         for(size_t i = 0; i < count; i++)
           container.insert(container.end(), *(pelem++));