diff --git a/Lib/multiprocessing/managers.py b/Lib/multiprocessing/managers.py
@@ -967,7 +967,7 @@ def MakeProxyType(name, exposed, _cache={}):


def AutoProxy(token, serializer, manager=None, authkey=None,
-              exposed=None, incref=True):
    '''
    Return an auto-proxy for `token`
    '''
@@ -987,7 +987,7 @@ def AutoProxy(token, serializer, manager=None, authkey=None,

    ProxyType = MakeProxyType('AutoProxy[%s]' % token.typeid, exposed)
    proxy = ProxyType(token, serializer, manager=manager, authkey=authkey,
-                      incref=incref)
    proxy._isauto = True
    return proxy


diff --git a/Lib/test/_test_multiprocessing.py b/Lib/test/_test_multiprocessing.py
@@ -2286,6 +2286,16 @@ def test_dict_proxy_nested(self):
        self.assertIsInstance(outer[0], list)  # Not a ListProxy
        self.assertEqual(outer[-1][-1]['feed'], 3)

    def test_namespace(self):
        n = self.Namespace()
        n.name = 'Bob'

diff --git a/Misc/NEWS.d/next/Tests/2019-09-25-18-10-10.bpo-30256.A5i76Q.rst b/Misc/NEWS.d/next/Tests/2019-09-25-18-10-10.bpo-30256.A5i76Q.rst
@@ -0,0 +1,2 @@