diff --git a/hgext/remotenames.py b/hgext/remotenames.py
--- a/hgext/remotenames.py
+++ b/hgext/remotenames.py
@@ -23,6 +23,11 @@
 from __future__ import absolute_import
 
 import collections
+try:
+    from collections import abc
+    mutablemapping = abc.MutableMapping
+except ImportError:
+    mutablemapping = collections.MutableMapping
 
 from mercurial.i18n import _
 
@@ -56,7 +61,7 @@
     default=True,
 )
 
-class lazyremotenamedict(collections.MutableMapping):
+class lazyremotenamedict(mutablemapping):
     """
     Read-only dict-like Class to lazily resolve remotename entries