diff --git a/pymc/step_methods/hmc/nuts.py b/pymc/step_methods/hmc/nuts.py
index 0f19d3c08..c927d57e3 100644
--- a/pymc/step_methods/hmc/nuts.py
+++ b/pymc/step_methods/hmc/nuts.py
@@ -236,7 +236,7 @@ def competence(var, has_grad):
     def _progressbar_config(n_chains=1):
         columns = [
             TextColumn("{task.fields[divergences]}", table_column=Column("Divergences", ratio=1)),
-            TextColumn("{task.fields[step_size]:0.2f}", table_column=Column("Step size", ratio=1)),
+            TextColumn("{task.fields[step_size]:0.3f}", table_column=Column("Step size", ratio=1)),
             TextColumn("{task.fields[tree_size]}", table_column=Column("Grad evals", ratio=1)),
         ]