diff --git a/addons/hw_scale/controllers/main.py b/addons/hw_scale/controllers/main.py
index 3c4aa12a1b9..ed2d898fcfc 100644
--- a/addons/hw_scale/controllers/main.py
+++ b/addons/hw_scale/controllers/main.py
@@ -7,7 +7,6 @@ from os.path import join
 from threading import Thread, Lock
 from select import select
 from Queue import Queue, Empty
-from bitstring import BitArray
 
 import openerp
 import openerp.addons.hw_proxy.controllers.main as hw_proxy