diff -r 7530caa5ed1a Objects/descrobject.c
--- a/Objects/descrobject.c	Wed Apr 20 10:02:04 2016 +0200
+++ b/Objects/descrobject.c	Thu Apr 21 10:51:13 2016 +0300
@@ -1393,14 +1393,16 @@ property_descr_get(PyObject *self, PyObj
     }
     Py_INCREF(args);
     assert (Py_REFCNT(args) == 2);
+    Py_SIZE(args) = 1;
     Py_INCREF(obj);
     PyTuple_SET_ITEM(args, 0, obj);
     ret = PyObject_Call(gs->prop_get, args, NULL);
     if (args == cached_args) {
         if (Py_REFCNT(args) == 2) {
-            obj = PyTuple_GET_ITEM(args, 0);
-            PyTuple_SET_ITEM(args, 0, NULL);
-            Py_XDECREF(obj);
+            assert(Py_SIZE(args) == 1);
+            assert(PyTuple_GET_ITEM(args, 0) == obj);
+            Py_SIZE(args) = 0;
+            Py_DECREF(obj);
         }
         else {
             Py_CLEAR(cached_args);