diff --git a/mitogen/sudo.py b/mitogen/sudo.py
index cf8a44d9..554c8926 100644
--- a/mitogen/sudo.py
+++ b/mitogen/sudo.py
@@ -28,7 +28,6 @@
 
 import logging
 import optparse
-import os
 import time
 
 import mitogen.core