diff --git a/python/handwritten/nonlinear/Values.cpp b/python/handwritten/nonlinear/Values.cpp
index 205f7fe23..0d1349972 100644
--- a/python/handwritten/nonlinear/Values.cpp
+++ b/python/handwritten/nonlinear/Values.cpp
@@ -68,15 +68,15 @@ void exportValues(){
   .def("insert", insert_bias)
   .def("insert", insert_navstate)
   .def("insert", insert_vector3)
-  .def("atPoint2", &Values::at<Point2>, return_value_policy<copy_const_reference>())
-  .def("atRot2", &Values::at<Rot2>, return_value_policy<copy_const_reference>())
-  .def("atPose2", &Values::at<Pose2>, return_value_policy<copy_const_reference>())
-  .def("atPoint3", &Values::at<Point3>, return_value_policy<copy_const_reference>())
-  .def("atRot3", &Values::at<Rot3>, return_value_policy<copy_const_reference>())
-  .def("atPose3", &Values::at<Pose3>, return_value_policy<copy_const_reference>())
-  .def("atConstantBias", &Values::at<Bias>, return_value_policy<copy_const_reference>())
-  .def("atNavState", &Values::at<NavState>, return_value_policy<copy_const_reference>())
-  .def("atVector3", &Values::at<Vector3>, return_value_policy<copy_const_reference>())
+  .def("atPoint2", &Values::at<Point2>)
+  .def("atRot2", &Values::at<Rot2>)
+  .def("atPose2", &Values::at<Pose2>)
+  .def("atPoint3", &Values::at<Point3>)
+  .def("atRot3", &Values::at<Rot3>)
+  .def("atPose3", &Values::at<Pose3>)
+  .def("atConstantBias", &Values::at<Bias>)
+  .def("atNavState", &Values::at<NavState>)
+  .def("atVector3", &Values::at<Vector3>)
   .def("exists", exists1)
   .def("keys", &Values::keys)
   ;