diff --git a/gtsam/nonlinear/Values.h b/gtsam/nonlinear/Values.h
index 7e95852a5..21e8e281f 100644
--- a/gtsam/nonlinear/Values.h
+++ b/gtsam/nonlinear/Values.h
@@ -29,6 +29,11 @@
 #include <gtsam/base/GenericValue.h>
 #include <gtsam/base/VectorSpace.h>
 
+#ifdef GTSAM_ENABLE_BOOST_SERIALIZATION
+#include <boost/serialization/unique_ptr.hpp>
+#endif
+
+
 #include <memory>
 #include <string>
 #include <utility>