diff --git a/include/tao/pq/table_writer.hpp b/include/tao/pq/table_writer.hpp
index d634793..18c25bf 100644
--- a/include/tao/pq/table_writer.hpp
+++ b/include/tao/pq/table_writer.hpp
@@ -32,7 +32,7 @@ namespace tao::pq
       template< std::size_t... Os, std::size_t... Is, typename... Ts >
       void insert_indexed( std::index_sequence< Os... > /*unused*/,
                            std::index_sequence< Is... > /*unused*/,
-                           const Ts...& ts )
+                           const Ts&... ts )
       {
          std::string buffer;
          ( ( ts...[ Os ].template copy_to< Is >( buffer ), buffer += '\t' ), ... );
diff --git a/include/tao/pq/transaction.hpp b/include/tao/pq/transaction.hpp
index 0b47017..13629a6 100644
--- a/include/tao/pq/transaction.hpp
+++ b/include/tao/pq/transaction.hpp
@@ -74,7 +74,7 @@ namespace tao::pq
       void send_indexed( const char* statement,
                          std::index_sequence< Os... > /*unused*/,
                          std::index_sequence< Is... > /*unused*/,
-                         const Ts...& ts )
+                         const Ts&... ts )
       {
          const Oid types[] = { static_cast< Oid >( ts...[ Os ].template type< Is >() )... };
          const char* const values[] = { ts...[ Os ].template value< Is >()... };