diff --git a/gtsam/discrete/AlgebraicDecisionTree.h b/gtsam/discrete/AlgebraicDecisionTree.h
index cc3c8b8d7..b3f0d69b0 100644
--- a/gtsam/discrete/AlgebraicDecisionTree.h
+++ b/gtsam/discrete/AlgebraicDecisionTree.h
@@ -71,7 +71,7 @@ namespace gtsam {
       static inline double id(const double& x) { return x; }
     };
 
-    AlgebraicDecisionTree() : Base(1.0) {}
+    AlgebraicDecisionTree(double leaf = 1.0) : Base(leaf) {}
 
     // Explicitly non-explicit constructor
     AlgebraicDecisionTree(const Base& add) : Base(add) {}