diff --git a/src/calibre/devices/udisks.py b/src/calibre/devices/udisks.py
index d79b626f36..105326519a 100644
--- a/src/calibre/devices/udisks.py
+++ b/src/calibre/devices/udisks.py
@@ -5,7 +5,7 @@ __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
 __docformat__ = 'restructuredtext en'
 
-import dbus, os
+import dbus
 
 def node_mountpoint(node):
 
@@ -23,8 +23,6 @@ def node_mountpoint(node):
 class UDisks(object):
 
     def __init__(self):
-        if os.environ.get('CALIBRE_DISABLE_UDISKS', False):
-            raise Exception('User has aborted use of UDISKS')
         self.bus = dbus.SystemBus()
         self.main = dbus.Interface(self.bus.get_object('org.freedesktop.UDisks',
                         '/org/freedesktop/UDisks'), 'org.freedesktop.UDisks')
diff --git a/src/calibre/manual/customize.rst b/src/calibre/manual/customize.rst
index d10a442c45..239c31bcec 100644
--- a/src/calibre/manual/customize.rst
+++ b/src/calibre/manual/customize.rst
@@ -30,7 +30,6 @@ Environment variables
     * ``CALIBRE_OVERRIDE_DATABASE_PATH`` - allows you to specify the full path to metadata.db. Using this variable you can have metadata.db be in a location other than the library folder. Useful if your library folder is on a networked drive that does not support file locking.
     * ``CALIBRE_DEVELOP_FROM`` - Used to run from a calibre development environment. See :ref:`develop`.
     * ``CALIBRE_OVERRIDE_LANG`` - Used to force the language used by the interface (ISO 639 language code)
-    * ``CALIBRE_DISABLE_UDISKS`` - Used to disable the use of udisks for mounting/ejecting. Set it to 1 to use calibre-mount-helper instead.
     * ``SYSFS_PATH`` - Use if sysfs is mounted somewhere other than /sys
     * ``http_proxy`` - Used on linux to specify an HTTP proxy