diff --git a/gtsam/discrete/DiscreteConditional.cpp b/gtsam/discrete/DiscreteConditional.cpp
index 26f38e278..06a08eca5 100644
--- a/gtsam/discrete/DiscreteConditional.cpp
+++ b/gtsam/discrete/DiscreteConditional.cpp
@@ -45,7 +45,8 @@ template class GTSAM_EXPORT
 /* ************************************************************************** */
 DiscreteConditional::DiscreteConditional(const size_t nrFrontals,
                                          const DecisionTreeFactor& f)
-    : BaseFactor(f / f.sum(nrFrontals)), BaseConditional(nrFrontals) {}
+    : BaseFactor(f / f.sum(nrFrontals)->toDecisionTreeFactor()),
+      BaseConditional(nrFrontals) {}
 
 /* ************************************************************************** */
 DiscreteConditional::DiscreteConditional(size_t nrFrontals,