diff --git a/bench/utils.py b/bench/utils.py
index 043a5ea7..95e2cc26 100755
--- a/bench/utils.py
+++ b/bench/utils.py
@@ -1,4 +1,4 @@
-import os, sys, shutil, subprocess, logging, itertools, requests, json, platform, select, pwd, grp, multiprocessing
+import os, sys, shutil, subprocess, logging, itertools, requests, json, platform, select, pwd, grp, multiprocessing, hashlib
 from distutils.spawn import find_executable
 import bench
 from bench import env