diff --git a/src/mlpack/methods/hoeffding_trees/hoeffding_tree_impl.hpp b/src/mlpack/methods/hoeffding_trees/hoeffding_tree_impl.hpp
index 534f1db850..342416e986 100644
--- a/src/mlpack/methods/hoeffding_trees/hoeffding_tree_impl.hpp
+++ b/src/mlpack/methods/hoeffding_trees/hoeffding_tree_impl.hpp
@@ -502,10 +502,13 @@ size_t HoeffdingTree<
     return 0; // Not sure what to do here...
 }
         
-template<typename FitnessFunction,
-         template<typename> class NumericSplitType,
-         template<typename> class CategoricalSplitType>
-size_t mlpack::tree::HoeffdingTree<FitnessFunction,
+template<
+    typename FitnessFunction,
+    template<typename> class NumericSplitType,
+    template<typename> class CategoricalSplitType
+>
+size_t mlpack::tree::HoeffdingTree<
+    FitnessFunction,
     NumericSplitType, 
     CategoricalSplitType
 >::NumDescendants()