diff --git a/gtsam/linear/SubgraphBuilder.h b/gtsam/linear/SubgraphBuilder.h
index 21b8d8690..5247ea2a2 100644
--- a/gtsam/linear/SubgraphBuilder.h
+++ b/gtsam/linear/SubgraphBuilder.h
@@ -22,8 +22,6 @@
 #include <gtsam/dllexport.h>
 
 #include <boost/serialization/nvp.hpp>
-#include <boost/serialization/version.hpp>
-#include <boost/serialization/optional.hpp>
 #include <boost/shared_ptr.hpp>
 
 #include <vector>