diff --git a/src/calibre/gui2/store/stores/bn_plugin.py b/src/calibre/gui2/store/stores/bn_plugin.py
index eac1a6d5a4..1f7eb2a91e 100644
--- a/src/calibre/gui2/store/stores/bn_plugin.py
+++ b/src/calibre/gui2/store/stores/bn_plugin.py
@@ -6,7 +6,6 @@ __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
 
-import random
 import urllib
 from contextlib import closing
 
diff --git a/src/calibre/gui2/tools.py b/src/calibre/gui2/tools.py
index e915545d1a..36c1a6f30f 100644
--- a/src/calibre/gui2/tools.py
+++ b/src/calibre/gui2/tools.py
@@ -11,7 +11,6 @@ import cPickle, os
 
 from PyQt4.Qt import QDialog, QProgressDialog, QString, QTimer
 
-from calibre.constants import DEBUG
 from calibre.ptempfile import PersistentTemporaryFile
 from calibre.gui2 import warning_dialog, question_dialog
 from calibre.gui2.convert.single import NoSupportedInputFormats