diff -r ae6813d21859 Lib/test/test_getargs2.py
--- a/Lib/test/test_getargs2.py	Thu Sep 22 11:43:46 2016 +0300
+++ b/Lib/test/test_getargs2.py	Thu Sep 22 12:49:18 2016 +0300
@@ -471,7 +471,7 @@ class Tuple_TestCase(unittest.TestCase):
 
         ret = get_args(*TupleSubclass([1, 2]))
         self.assertEqual(ret, (1, 2))
-        self.assertIsInstance(ret, tuple)
+        self.assertIs(type(ret), tuple)
 
         ret = get_args()
         self.assertIn(ret, ((), None))
diff -r ae6813d21859 Python/ceval.c
--- a/Python/ceval.c	Thu Sep 22 11:43:46 2016 +0300
+++ b/Python/ceval.c	Thu Sep 22 12:49:18 2016 +0300
@@ -3310,7 +3310,7 @@ PyObject *
             }
             callargs = POP();
             func = TOP();
-            if (!PyTuple_Check(callargs)) {
+            if (!PyTuple_CheckExact(callargs)) {
                 if (Py_TYPE(callargs)->tp_iter == NULL &&
                         !PySequence_Check(callargs)) {
                     PyErr_Format(PyExc_TypeError,
@@ -3327,7 +3327,7 @@ PyObject *
                     goto error;
                 }
             }
-            assert(PyTuple_Check(callargs));
+            assert(PyTuple_CheckExact(callargs));
 
             result = do_call_core(func, callargs, kwargs);
             Py_DECREF(func);