diff --git a/src/calibre/gui2/toc/main.py b/src/calibre/gui2/toc/main.py
index a4e8cf7be1..9314cfbbee 100644
--- a/src/calibre/gui2/toc/main.py
+++ b/src/calibre/gui2/toc/main.py
@@ -10,7 +10,7 @@ __docformat__ = 'restructuredtext en'
 import sys, os, textwrap
 from threading import Thread
 from functools import partial
-from polyglot.builtins import iteritems, map, unicode_type, range
+from polyglot.builtins import map, unicode_type, range
 
 from PyQt5.Qt import (QPushButton, QFrame, QMenu, QInputDialog, QCheckBox,
     QDialog, QVBoxLayout, QDialogButtonBox, QSize, QStackedWidget, QWidget,
@@ -401,13 +401,13 @@ class TreeWidget(QTreeWidget):  # {{{
         self.push_history()
         return QTreeWidget.commitData(self, editor)
 
-    def iteritems(self, parent=None):
+    def iter_items(self, parent=None):
         if parent is None:
             parent = self.invisibleRootItem()
         for i in range(parent.childCount()):
             child = parent.child(i)
             yield child
-            for gc in self.iteritems(parent=child):
+            for gc in self.iter_items(parent=child):
                 yield gc
 
     def update_status_tip(self, item):
@@ -469,7 +469,7 @@ class TreeWidget(QTreeWidget):  # {{{
             # For order to be be preserved when moving by drag and drop, we
             # have to ensure that selectedIndexes returns an ordered list of
             # indexes.
-            sort_map = {self.indexFromItem(item):i for i, item in enumerate(iteritems(self))}
+            sort_map = {self.indexFromItem(item):i for i, item in enumerate(self.iter_items())}
             ans = sorted(ans, key=lambda x:sort_map.get(x, -1))
         return ans
 
@@ -615,7 +615,7 @@ class TreeWidget(QTreeWidget):  # {{{
 
     def bulk_rename(self):
         from calibre.gui2.tweak_book.file_list import get_bulk_rename_settings
-        sort_map = {item:i for i, item in enumerate(iteritems(self))}
+        sort_map = {item:i for i, item in enumerate(self.iter_items())}
         items = sorted(self.selectedItems(), key=lambda x:sort_map.get(x, -1))
         settings = get_bulk_rename_settings(self, len(items), prefix=_('Chapter '), msg=_(
             'All selected items will be renamed to the form prefix-number'), sanitize=lambda x:x, leading_zeros=False)
@@ -775,8 +775,8 @@ class TOCView(QWidget):  # {{{
             p = item.parent() or self.root
             p.removeChild(item)
 
-    def iteritems(self, parent=None):
-        for item in self.tocw.iteritems(parent=parent):
+    def iter_items(self, parent=None):
+        for item in self.tocw.iter_items(parent=parent):
             yield item
 
     def flatten_toc(self):
@@ -784,7 +784,7 @@ class TOCView(QWidget):  # {{{
         found = True
         while found:
             found = False
-            for item in iteritems(self):
+            for item in self.iter_items():
                 if item.childCount() > 0:
                     self._flatten_item(item)
                     found = True