diff --git a/gtsam_unstable/discrete/AllDiff.h b/gtsam_unstable/discrete/AllDiff.h
index 032808dcd..cfbd76e7c 100644
--- a/gtsam_unstable/discrete/AllDiff.h
+++ b/gtsam_unstable/discrete/AllDiff.h
@@ -56,8 +56,8 @@ class GTSAM_UNSTABLE_EXPORT AllDiff : public Constraint {
   /// Multiply factors, DiscreteFactor::shared_ptr edition
   DiscreteFactor::shared_ptr multiply(
       const DiscreteFactor::shared_ptr& df) const override {
-    return std::make_shared<DecisionTreeFactor>(this->toDecisionTreeFactor() *
-                                                df->toDecisionTreeFactor());
+    return std::make_shared<DecisionTreeFactor>(
+        this->operator*(df->toDecisionTreeFactor()));
   }
 
   /// Compute error for each assignment and return as a tree
diff --git a/gtsam_unstable/discrete/BinaryAllDiff.h b/gtsam_unstable/discrete/BinaryAllDiff.h
index 0ebae4d77..a1a2bf0a6 100644
--- a/gtsam_unstable/discrete/BinaryAllDiff.h
+++ b/gtsam_unstable/discrete/BinaryAllDiff.h
@@ -72,8 +72,8 @@ class BinaryAllDiff : public Constraint {
   /// Multiply factors, DiscreteFactor::shared_ptr edition
   DiscreteFactor::shared_ptr multiply(
       const DiscreteFactor::shared_ptr& df) const override {
-    return std::make_shared<DecisionTreeFactor>(this->toDecisionTreeFactor() *
-                                                df->toDecisionTreeFactor());
+    return std::make_shared<DecisionTreeFactor>(
+        this->operator*(df->toDecisionTreeFactor()));
   }
 
   /*
diff --git a/gtsam_unstable/discrete/Domain.h b/gtsam_unstable/discrete/Domain.h
index 9a4a21847..dea85934f 100644
--- a/gtsam_unstable/discrete/Domain.h
+++ b/gtsam_unstable/discrete/Domain.h
@@ -93,8 +93,8 @@ class GTSAM_UNSTABLE_EXPORT Domain : public Constraint {
   /// Multiply factors, DiscreteFactor::shared_ptr edition
   DiscreteFactor::shared_ptr multiply(
       const DiscreteFactor::shared_ptr& df) const override {
-    return std::make_shared<DecisionTreeFactor>(this->toDecisionTreeFactor() *
-                                                df->toDecisionTreeFactor());
+    return std::make_shared<DecisionTreeFactor>(
+        this->operator*(df->toDecisionTreeFactor()));
   }
 
   /*
diff --git a/gtsam_unstable/discrete/SingleValue.h b/gtsam_unstable/discrete/SingleValue.h
index ebe23f7e4..8675c929b 100644
--- a/gtsam_unstable/discrete/SingleValue.h
+++ b/gtsam_unstable/discrete/SingleValue.h
@@ -66,8 +66,8 @@ class GTSAM_UNSTABLE_EXPORT SingleValue : public Constraint {
   /// Multiply factors, DiscreteFactor::shared_ptr edition
   DiscreteFactor::shared_ptr multiply(
       const DiscreteFactor::shared_ptr& df) const override {
-    return std::make_shared<DecisionTreeFactor>(this->toDecisionTreeFactor() *
-                                                df->toDecisionTreeFactor());
+    return std::make_shared<DecisionTreeFactor>(
+        this->operator*(df->toDecisionTreeFactor()));
   }
 
   /*