diff --git a/include/boost/interprocess/detail/segment_manager_helper.hpp b/include/boost/interprocess/detail/segment_manager_helper.hpp
index de788ce8..2e652143 100644
--- a/include/boost/interprocess/detail/segment_manager_helper.hpp
+++ b/include/boost/interprocess/detail/segment_manager_helper.hpp
@@ -386,7 +386,7 @@ struct block_header
    static size_type value_offset()
    {  return size_type(sizeof(block_header));   }
 
-   template<std::size_t CharAlign>
+   template<size_type CharAlign>
    size_type name_offset() const
    {  return get_rounded_size(this->name_length_offset()+sizeof(name_len_t), CharAlign);  }