diff --git a/gtsam/geometry/geometry.i b/gtsam/geometry/geometry.i
index a40951d3e..0def84265 100644
--- a/gtsam/geometry/geometry.i
+++ b/gtsam/geometry/geometry.i
@@ -27,9 +27,6 @@ class Point2 {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
   
 class Point2Pairs {
@@ -104,9 +101,6 @@ class StereoPoint2 {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 #include <gtsam/geometry/Point3.h>
@@ -131,9 +125,6 @@ class Point3 {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 class Point3Pairs {
@@ -191,9 +182,6 @@ class Rot2 {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 #include <gtsam/geometry/SO3.h>
@@ -372,9 +360,6 @@ class Rot3 {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 #include <gtsam/geometry/Pose2.h>
@@ -433,9 +418,6 @@ class Pose2 {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
   
 boost::optional<gtsam::Pose2> align(const gtsam::Point2Pairs& pairs);
@@ -502,9 +484,6 @@ class Pose3 {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 class Pose3Pairs {
@@ -547,9 +526,6 @@ class Unit3 {
   // enabling serialization functionality
   void serialize() const;
 
-  // enable pickling in python
-  void pickle() const;
-
   // enabling function to compare objects
   bool equals(const gtsam::Unit3& expected, double tol) const;
 };
@@ -611,9 +587,6 @@ class Cal3_S2 {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 #include <gtsam/geometry/Cal3DS2_Base.h>
@@ -642,9 +615,6 @@ virtual class Cal3DS2_Base {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 #include <gtsam/geometry/Cal3DS2.h>
@@ -668,9 +638,6 @@ virtual class Cal3DS2 : gtsam::Cal3DS2_Base {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 #include <gtsam/geometry/Cal3Unified.h>
@@ -705,9 +672,6 @@ virtual class Cal3Unified : gtsam::Cal3DS2_Base {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 #include <gtsam/geometry/Cal3Fisheye.h>
@@ -750,9 +714,6 @@ class Cal3Fisheye {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 #include <gtsam/geometry/Cal3_S2Stereo.h>
@@ -811,9 +772,6 @@ class Cal3Bundler {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 #include <gtsam/geometry/CalibratedCamera.h>
@@ -847,9 +805,6 @@ class CalibratedCamera {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 #include <gtsam/geometry/PinholeCamera.h>
@@ -889,9 +844,6 @@ class PinholeCamera {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 #include <gtsam/geometry/Similarity3.h>
@@ -962,9 +914,6 @@ class StereoCamera {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 #include <gtsam/geometry/triangulation.h>
diff --git a/gtsam/gtsam.i b/gtsam/gtsam.i
index 6ac63c93f..d4e959c3d 100644
--- a/gtsam/gtsam.i
+++ b/gtsam/gtsam.i
@@ -39,9 +39,6 @@ class KeyList {
   void remove(size_t key);
 
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 // Actually a FastSet<Key>
@@ -67,9 +64,6 @@ class KeySet {
   bool count(size_t key) const;  // returns true if value exists
 
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 // Actually a vector<Key>
@@ -91,9 +85,6 @@ class KeyVector {
   void push_back(size_t key) const;
 
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 // Actually a FastMap<Key,int>
diff --git a/gtsam/linear/linear.i b/gtsam/linear/linear.i
index d882cb38b..7b1ce550f 100644
--- a/gtsam/linear/linear.i
+++ b/gtsam/linear/linear.i
@@ -34,9 +34,6 @@ virtual class Gaussian : gtsam::noiseModel::Base {
 
   // enabling serialization functionality
   void serializable() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 virtual class Diagonal : gtsam::noiseModel::Gaussian {
@@ -52,9 +49,6 @@ virtual class Diagonal : gtsam::noiseModel::Gaussian {
 
   // enabling serialization functionality
   void serializable() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 virtual class Constrained : gtsam::noiseModel::Diagonal {
@@ -72,9 +66,6 @@ virtual class Constrained : gtsam::noiseModel::Diagonal {
 
     // enabling serialization functionality
     void serializable() const;
-
-    // enable pickling in python
-    void pickle() const;
 };
 
 virtual class Isotropic : gtsam::noiseModel::Diagonal {
@@ -87,9 +78,6 @@ virtual class Isotropic : gtsam::noiseModel::Diagonal {
 
   // enabling serialization functionality
   void serializable() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 virtual class Unit : gtsam::noiseModel::Isotropic {
@@ -97,9 +85,6 @@ virtual class Unit : gtsam::noiseModel::Isotropic {
 
   // enabling serialization functionality
   void serializable() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 namespace mEstimator {
@@ -270,9 +255,6 @@ class VectorValues {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 #include <gtsam/linear/GaussianFactor.h>
@@ -344,9 +326,6 @@ virtual class JacobianFactor : gtsam::GaussianFactor {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 #include <gtsam/linear/HessianFactor.h>
@@ -379,9 +358,6 @@ virtual class HessianFactor : gtsam::GaussianFactor {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 #include <gtsam/linear/GaussianFactorGraph.h>
@@ -463,9 +439,6 @@ class GaussianFactorGraph {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 #include <gtsam/linear/GaussianConditional.h>
diff --git a/gtsam/navigation/navigation.i b/gtsam/navigation/navigation.i
index 1f9ffcf2e..c2a3bcdb4 100644
--- a/gtsam/navigation/navigation.i
+++ b/gtsam/navigation/navigation.i
@@ -44,9 +44,6 @@ class ConstantBias {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 }///\namespace imuBias
@@ -73,9 +70,6 @@ class NavState {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 #include <gtsam/navigation/PreintegratedRotation.h>
@@ -121,9 +115,6 @@ virtual class PreintegrationParams : gtsam::PreintegratedRotationParams {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 #include <gtsam/navigation/ImuFactor.h>
@@ -156,9 +147,6 @@ class PreintegratedImuMeasurements {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 virtual class ImuFactor: gtsam::NonlinearFactor {
diff --git a/gtsam/nonlinear/nonlinear.i b/gtsam/nonlinear/nonlinear.i
index 8407668cb..960b3ff27 100644
--- a/gtsam/nonlinear/nonlinear.i
+++ b/gtsam/nonlinear/nonlinear.i
@@ -131,9 +131,6 @@ class Ordering {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 #include <gtsam/nonlinear/NonlinearFactorGraph.h>
@@ -196,9 +193,6 @@ class NonlinearFactorGraph {
   // enabling serialization functionality
   void serialize() const;
 
-  // enable pickling in python
-  void pickle() const;
-
   void saveGraph(const string& s) const;
 };
 
@@ -290,9 +284,6 @@ class Values {
   // enabling serialization functionality
   void serialize() const;
 
-  // enable pickling in python
-  void pickle() const;
-
   // New in 4.0, we have to specialize every insert/update/at to generate
   // wrappers Instead of the old: void insert(size_t j, const gtsam::Value&
   // value); void update(size_t j, const gtsam::Value& val); gtsam::Value
@@ -851,9 +842,6 @@ virtual class PriorFactor : gtsam::NoiseModelFactor {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 #include <gtsam/nonlinear/NonlinearEquality.h>
diff --git a/gtsam/slam/slam.i b/gtsam/slam/slam.i
index da1c197cb..d276c4f2e 100644
--- a/gtsam/slam/slam.i
+++ b/gtsam/slam/slam.i
@@ -21,9 +21,6 @@ virtual class BetweenFactor : gtsam::NoiseModelFactor {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 #include <gtsam/slam/ProjectionFactor.h>
@@ -172,9 +169,6 @@ virtual class PoseTranslationPrior : gtsam::NoiseModelFactor {
 
   // enabling serialization functionality
   void serialize() const;
-
-  // enable pickling in python
-  void pickle() const;
 };
 
 typedef gtsam::PoseTranslationPrior<gtsam::Pose2> PoseTranslationPrior2D;
@@ -234,9 +228,6 @@ class SfmTrack {
   // enabling serialization functionality
   void serialize() const;
 
-  // enable pickling in python
-  void pickle() const;
-
   // enabling function to compare objects
   bool equals(const gtsam::SfmTrack& expected, double tol) const;
 };
@@ -253,9 +244,6 @@ class SfmData {
   // enabling serialization functionality
   void serialize() const;
 
-  // enable pickling in python
-  void pickle() const;
-
   // enabling function to compare objects
   bool equals(const gtsam::SfmData& expected, double tol) const;
 };