diff --git a/gtsam/nonlinear/Values.h b/gtsam/nonlinear/Values.h
index 4b0fceaf9..e48b11b32 100644
--- a/gtsam/nonlinear/Values.h
+++ b/gtsam/nonlinear/Values.h
@@ -39,6 +39,7 @@
 #pragma GCC diagnostic pop
 #endif
 #include <boost/ptr_container/serialize_ptr_map.hpp>
+#include <boost/shared_ptr.hpp>
 
 #include <string>
 #include <utility>