diff --git a/gtsam/inference/ConditionalUnordered.h b/gtsam/inference/ConditionalUnordered.h
index 4d0c6ef9e..68724e982 100644
--- a/gtsam/inference/ConditionalUnordered.h
+++ b/gtsam/inference/ConditionalUnordered.h
@@ -137,7 +137,6 @@ namespace gtsam {
     friend class boost::serialization::access;
     template<class ARCHIVE>
     void serialize(ARCHIVE & ar, const unsigned int version) {
-      ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(Base);
       ar & BOOST_SERIALIZATION_NVP(nrFrontals_);
     }