1 diff --git a/unittest2/compatibility.py b/unittest2/compatibility.py
2 index 9e5f1a5..473957c 100644
3 --- a/unittest2/compatibility.py
4 +++ b/unittest2/compatibility.py
7 +import collections.abc
11 @@ -140,7 +141,7 @@ except ImportError:
12 ### ChainMap (helper for configparser and string.Template)
13 ########################################################################
15 -class ChainMap(collections.MutableMapping):
16 +class ChainMap(collections.abc.MutableMapping):
17 ''' A ChainMap groups multiple dicts (or other mappings) together
18 to create a single, updateable view.