diff --git a/docs/exts/sphinxtr/custombackports.py b/docs/exts/sphinxtr/custombackports.py
index 8741cd1f..a2657d2d 100644
--- a/docs/exts/sphinxtr/custombackports.py
+++ b/docs/exts/sphinxtr/custombackports.py
@@ -1,9 +1,11 @@
 import collections
 
+collections_abc = getattr(collections, 'abc', collections)
+
 Set = set
 
 try:
-    from collections import OrderedDict
+    from collections_abc import OrderedDict
 except ImportError:
     class OrderedDict(dict):
         'Dictionary that remembers insertion order'
@@ -252,7 +254,7 @@ except ImportError:
 
 KEY, PREV, NEXT = range(3)
 
-class OrderedSet(collections.MutableSet):
+class OrderedSet(collections_abc.MutableSet):
   """
   From: http://code.activestate.com/recipes/576694/
   """