diff --git a/src/calibre/db/legacy.py b/src/calibre/db/legacy.py
index d93491a032..2dddab5c99 100644
--- a/src/calibre/db/legacy.py
+++ b/src/calibre/db/legacy.py
@@ -289,11 +289,11 @@ class LibraryDatabase:
         return [[k, v] for k, v in self.new_api.get_usage_count_by_id(field).items()]
 
     def field_id_map(self, field):
-        return list(iteritems(self.new_api.get_id_map(field)))
+        return list(self.new_api.get_id_map(field).items())
 
     def get_custom_items_with_ids(self, label=None, num=None):
         try:
-            return [[k, v] for k, v in iteritems(self.new_api.get_id_map(self.custom_field_name(label, num)))]
+            return [[k, v] for k, v in self.new_api.get_id_map(self.custom_field_name(label, num)).items()]
         except ValueError:
             return []
 
diff --git a/src/calibre/ebooks/oeb/transforms/split.py b/src/calibre/ebooks/oeb/transforms/split.py
index a01f03af34..782a390312 100644
--- a/src/calibre/ebooks/oeb/transforms/split.py
+++ b/src/calibre/ebooks/oeb/transforms/split.py
@@ -25,7 +25,6 @@ from calibre.ebooks.epub import rules
 from calibre.ebooks.oeb.base import OEB_STYLES, XHTML, rewrite_links, urldefrag, urlnormalize
 from calibre.ebooks.oeb.base import XPNSMAP as NAMESPACES
 from calibre.ebooks.oeb.polish.split import do_split
-from polyglot.builtins import iteritems
 from polyglot.urllib import unquote
 
 XPath = functools.partial(_XPath, namespaces=NAMESPACES)
@@ -268,7 +267,7 @@ class FlowSplitter:
 
         self.trees = [orig_tree]
         while ordered_ids:
-            pb_id, (pattern, before) = next(iteritems(ordered_ids))
+            pb_id, (pattern, before) = next(iter(ordered_ids.items()))
             del ordered_ids[pb_id]
             for i in range(len(self.trees)-1, -1, -1):
                 tree = self.trees[i]
diff --git a/src/calibre/gui2/tweak_book/widgets.py b/src/calibre/gui2/tweak_book/widgets.py
index 62a577d97a..e6d640fde4 100644
--- a/src/calibre/gui2/tweak_book/widgets.py
+++ b/src/calibre/gui2/tweak_book/widgets.py
@@ -588,7 +588,7 @@ class NamesModel(QAbstractListModel):
         if not query:
             self.items = tuple((text, None) for text in self.names)
         else:
-            self.items = tuple(iteritems(self.matcher(query)))
+            self.items = tuple(self.matcher(query).items())
         self.endResetModel()
         self.filtered.emit(not bool(query))
 
diff --git a/src/calibre/utils/matcher.py b/src/calibre/utils/matcher.py
index 8948676f7e..6547c632e7 100644
--- a/src/calibre/utils/matcher.py
+++ b/src/calibre/utils/matcher.py
@@ -21,7 +21,6 @@ from calibre.constants import filesystem_encoding
 from calibre.utils.icu import lower as icu_lower
 from calibre.utils.icu import primary_collator, primary_find, primary_sort_key
 from calibre.utils.icu import upper as icu_upper
-from polyglot.builtins import iteritems
 
 DEFAULT_LEVEL1 = '/'
 DEFAULT_LEVEL2 = '-_ 0123456789'
@@ -360,7 +359,7 @@ def main(basedir=None, query=None):
                 break
             if not query:
                 break
-        for path, positions in islice(iteritems(m(query)), 0, 10):
+        for path, positions in islice(m(query).items(), 0, 10):
             positions = list(positions)
             p = 0
             while positions: