diff --git a/Tools/pybench/pybench.py b/Tools/pybench/pybench.py
index 76f1468..7c0cf7b 100755
--- a/Tools/pybench/pybench.py
+++ b/Tools/pybench/pybench.py
@@ -278,7 +278,7 @@
             for i in calibration_loops:
                 pass
             t = timer() - t
-            prep_times.append(t)
+            prep_times.append(t / CALIBRATION_LOOPS)
         min_prep_time = min(prep_times)
         if _debug:
             print