diff --git a/gtsam/discrete/DiscreteBayesTree.h b/gtsam/discrete/DiscreteBayesTree.h
index 34f8f5d4a..89baf49a9 100644
--- a/gtsam/discrete/DiscreteBayesTree.h
+++ b/gtsam/discrete/DiscreteBayesTree.h
@@ -110,4 +110,12 @@ class GTSAM_EXPORT DiscreteBayesTree
   /// @}
 };
 
+/// traits
+template <>
+struct traits<DiscreteBayesTreeClique>
+    : public Testable<DiscreteBayesTreeClique> {};
+
+template <>
+struct traits<DiscreteBayesTree> : public Testable<DiscreteBayesTree> {};
+
 }  // namespace gtsam
diff --git a/gtsam/hybrid/HybridBayesTree.h b/gtsam/hybrid/HybridBayesTree.h
index bc2a0f852..f91e16cbf 100644
--- a/gtsam/hybrid/HybridBayesTree.h
+++ b/gtsam/hybrid/HybridBayesTree.h
@@ -123,6 +123,10 @@ class GTSAM_EXPORT HybridBayesTree : public BayesTree<HybridBayesTreeClique> {
 };
 
 /// traits
+template <>
+struct traits<HybridBayesTreeClique> : public Testable<HybridBayesTreeClique> {
+};
+
 template <>
 struct traits<HybridBayesTree> : public Testable<HybridBayesTree> {};