diff --git a/gtsam/discrete/DiscreteConditional.cpp b/gtsam/discrete/DiscreteConditional.cpp
index 7db602795..78738dd54 100644
--- a/gtsam/discrete/DiscreteConditional.cpp
+++ b/gtsam/discrete/DiscreteConditional.cpp
@@ -483,6 +483,11 @@ double DiscreteConditional::evaluate(const Assignment<Key>& values) const {
   return BaseFactor::evaluate(values);
 }
 
+/* ************************************************************************* */
+double DiscreteConditional::setData(const DiscreteConditional::shared_ptr& dc) {
+  this->root_ = dc->root_;
+}
+
 /* ************************************************************************* */
 double DiscreteConditional::negLogConstant() const { return 0.0; }
 
diff --git a/gtsam/discrete/DiscreteConditional.h b/gtsam/discrete/DiscreteConditional.h
index c44a59577..318024faa 100644
--- a/gtsam/discrete/DiscreteConditional.h
+++ b/gtsam/discrete/DiscreteConditional.h
@@ -270,6 +270,9 @@ class GTSAM_EXPORT DiscreteConditional
    */
   double negLogConstant() const override;
 
+  /// Set the data from another DiscreteConditional.
+  virtual void setData(const DiscreteConditional::shared_ptr& dc);
+
   /// @}
 
  protected: