diff --git a/src/calibre/gui2/preferences/ignored_devices.py b/src/calibre/gui2/preferences/ignored_devices.py
index 8cfb943cf3..cef9ac0dc2 100644
--- a/src/calibre/gui2/preferences/ignored_devices.py
+++ b/src/calibre/gui2/preferences/ignored_devices.py
@@ -1,15 +1,16 @@
 #!/usr/bin/env python2
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
+# License: GPLv3 Copyright: 2012, Kovid Goyal <kovid at kovidgoyal.net>
 from __future__ import absolute_import, division, print_function, unicode_literals
 
-__license__   = 'GPL v3'
-__copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
-__docformat__ = 'restructuredtext en'
+import textwrap
 
-from PyQt5.Qt import (QLabel, QVBoxLayout, QListWidget, QListWidgetItem, Qt,
-                      QIcon)
+from PyQt5.Qt import (
+    QIcon, QLabel, QListWidget, QListWidgetItem, QPushButton, Qt, QVBoxLayout
+)
 
 from calibre.customize.ui import enable_plugin
+from calibre.gui2 import gprefs
 from calibre.gui2.preferences import ConfigWidgetBase, test_widget
 from polyglot.builtins import iteritems, range
 
@@ -22,6 +23,7 @@ class ConfigWidget(ConfigWidgetBase):
         self.gui = gui
         self.l = l = QVBoxLayout()
         self.setLayout(l)
+        self.confirms_reset = False
 
         self.la = la = QLabel(_(
             'The list of devices that you have asked calibre to ignore. '
@@ -46,11 +48,24 @@ class ConfigWidget(ConfigWidgetBase):
         f.itemChanged.connect(self.changed_signal)
         f.itemDoubleClicked.connect(self.toggle_item)
 
+        self.reset_confirmations_button = b = QPushButton(_('Reset allowed devices'))
+        b.setToolTip(textwrap.fill(_(
+            'This will erase the list of devices that calibre knows about'
+            ' causing it to ask you for permission to manage them again,'
+            ' the next time they connect')))
+        b.clicked.connect(self.reset_confirmations)
+        l.addWidget(b)
+
+    def reset_confirmations(self):
+        self.confirms_reset = True
+        self.changed_signal.emit()
+
     def toggle_item(self, item):
         item.setCheckState(Qt.Checked if item.checkState() == Qt.Unchecked else
                 Qt.Unchecked)
 
     def initialize(self):
+        self.confirms_reset = False
         self.devices.blockSignals(True)
         self.devices.clear()
         for dev in self.gui.device_manager.devices:
@@ -94,11 +109,13 @@ class ConfigWidget(ConfigWidgetBase):
             dev = e.data(Qt.UserRole)
             if e.checkState() == Qt.Unchecked:
                 enable_plugin(dev)
+        if self.confirms_reset:
+            gprefs['ask_to_manage_device'] = []
 
         return True  # Restart required
 
 
 if __name__ == '__main__':
-    from PyQt5.Qt import QApplication
-    app = QApplication([])
+    from calibre.gui2 import Application
+    app = Application([])
     test_widget('Sharing', 'Ignored Devices')