diff --git a/erp5/util/benchmark/argument.py b/erp5/util/benchmark/argument.py
index bdfefe44e77627578e0d9502ca74e52fc8355f7f..b46e5779636ddceed60a0c1e4e690737bf0123de 100644
--- a/erp5/util/benchmark/argument.py
+++ b/erp5/util/benchmark/argument.py
@@ -28,7 +28,6 @@
 
 import os
 import argparse
-import functools
 
 class ArgumentType(object):
   @classmethod
diff --git a/erp5/util/benchmark/process.py b/erp5/util/benchmark/process.py
index b7c31a4d0c7b8b4922acb1bb0b299a5a0b44b605..d2855aa86034e4695d36b32e1868b301a6141ef0 100644
--- a/erp5/util/benchmark/process.py
+++ b/erp5/util/benchmark/process.py
@@ -27,13 +27,9 @@
 ##############################################################################
 
 import multiprocessing
-import csv
 import traceback
-import os
-import logging
 import signal
 import sys
-import datetime
 import socket
 
 from ..testbrowser.browser import Browser