diff --git a/gtsam/linear/SharedGaussian.h b/gtsam/linear/SharedGaussian.h
index 3e6c5ce0f..7d86ab6d2 100644
--- a/gtsam/linear/SharedGaussian.h
+++ b/gtsam/linear/SharedGaussian.h
@@ -19,7 +19,6 @@
 #pragma once
 
 #include <gtsam/linear/NoiseModel.h>
-#include <gtsam/linear/SharedNoiseModel.h>
 
 namespace gtsam { // note, deliberately not in noiseModel namespace
 
diff --git a/gtsam/linear/SharedNoiseModel.h b/gtsam/linear/SharedNoiseModel.h
index 5216057ce..c7cc84ab5 100644
--- a/gtsam/linear/SharedNoiseModel.h
+++ b/gtsam/linear/SharedNoiseModel.h
@@ -12,6 +12,7 @@
 #pragma once
 
 #include <gtsam/linear/NoiseModel.h>
+#include <gtsam/linear/SharedGaussian.h>
 
 namespace gtsam { // note, deliberately not in noiseModel namespace
 
@@ -20,6 +21,7 @@ namespace gtsam { // note, deliberately not in noiseModel namespace
     typedef noiseModel::Base::shared_ptr Base;
 
     SharedNoiseModel() {}
+    SharedNoiseModel(const SharedGaussian &p): Base(p) {}
     SharedNoiseModel(const noiseModel::Robust::shared_ptr& p): Base(p) {}
     SharedNoiseModel(const noiseModel::Gaussian::shared_ptr& p): Base(p) {}
     SharedNoiseModel(const noiseModel::Diagonal::shared_ptr& p): Base(p) {}