Index: libs/serialization/src/basic_iarchive.cpp
===================================================================
--- libs/serialization/src/basic_iarchive.cpp	(revision 86343)
+++ libs/serialization/src/basic_iarchive.cpp	(working copy)
@@ -456,6 +456,7 @@
         BOOST_VERIFY(register_type(bpis_ptr->get_basic_serializer()) == cid);
         int i = cid;
         cobject_id_vector[i].bpis_ptr = bpis_ptr;
+        (void)new_cid; // Avoid warning when NDEBUG is on
     }
     int i = cid;
     cobject_id & co = cobject_id_vector[i];