diff --git a/gtsam/inference/BayesTree.h b/gtsam/inference/BayesTree.h
index 892ac5f31..c221a5ed6 100644
--- a/gtsam/inference/BayesTree.h
+++ b/gtsam/inference/BayesTree.h
@@ -89,14 +89,14 @@ namespace gtsam {
     /** Map from keys to Clique */
     typedef ConcurrentMap<Key, sharedClique> Nodes;
 
+    /** Root cliques */
+    typedef FastVector<sharedClique> Roots;
+
   protected:
 
     /** Map from indices to Clique */
     Nodes nodes_;
 
-    /** Root cliques */
-    typedef FastVector<sharedClique> Roots;
-
     /** Root cliques */
     Roots roots_;