diff --git a/gtsam/base/FastList.h b/gtsam/base/FastList.h
index 380836d1d..752b0b571 100644
--- a/gtsam/base/FastList.h
+++ b/gtsam/base/FastList.h
@@ -22,6 +22,8 @@
 #include <list>
 #include <boost/utility/enable_if.hpp>
 #include <boost/serialization/nvp.hpp>
+#include <boost/serialization/version.hpp>
+#include <boost/serialization/optional.hpp>
 #include <boost/serialization/list.hpp>
 
 namespace gtsam {
diff --git a/gtsam/linear/LossFunctions.h b/gtsam/linear/LossFunctions.h
index 4e6a2b609..c3d7d64db 100644
--- a/gtsam/linear/LossFunctions.h
+++ b/gtsam/linear/LossFunctions.h
@@ -25,10 +25,10 @@
 
 #include <boost/serialization/extended_type_info.hpp>
 #include <boost/serialization/nvp.hpp>
+#include <boost/serialization/version.hpp>
 #include <boost/serialization/optional.hpp>
 #include <boost/serialization/shared_ptr.hpp>
 #include <boost/serialization/singleton.hpp>
-#include <boost/serialization/version.hpp>
 
 namespace gtsam {
 namespace noiseModel {
diff --git a/gtsam/linear/SubgraphBuilder.h b/gtsam/linear/SubgraphBuilder.h
index 88c771ba5..84a477a5e 100644
--- a/gtsam/linear/SubgraphBuilder.h
+++ b/gtsam/linear/SubgraphBuilder.h
@@ -21,9 +21,9 @@
 #include <gtsam/base/types.h>
 #include <gtsam/dllexport.h>
 
+#include <boost/serialization/version.hpp>
 #include <boost/serialization/nvp.hpp>
 #include <boost/shared_ptr.hpp>
-#include <boost/serialization/version.hpp>
 
 #include <vector>