diff --git a/src/tree/updater_prune-inl.hpp b/src/tree/updater_prune-inl.hpp
index 2b90646be..6f964d6c3 100644
--- a/src/tree/updater_prune-inl.hpp
+++ b/src/tree/updater_prune-inl.hpp
@@ -69,7 +69,7 @@ class TreePruner: public IUpdater {
       }
     }
     if (silent == 0) {
-      utils::Printf("tree pruning end, %d roots, %d extra nodes, %d pruned nodes ,max_depth=%d\n",
+      utils::Printf("tree pruning end, %d roots, %d extra nodes, %d pruned nodes, max_depth=%d\n",
                     tree.param.num_roots, tree.num_extra_nodes(), npruned, tree.MaxDepth());
     }
   }