diff --git a/src/calibre/devices/kobo/bookmark.py b/src/calibre/devices/kobo/bookmark.py
index 3a74c53061..b70a491b64 100644
--- a/src/calibre/devices/kobo/bookmark.py
+++ b/src/calibre/devices/kobo/bookmark.py
@@ -5,7 +5,6 @@
 __docformat__ = 'restructuredtext en'
 
 import os
-from contextlib import closing
 
 
 class Bookmark(): # {{{