diff -r a8f3ca72f703 Python/ceval.c
--- a/Python/ceval.c	Fri Apr 11 15:37:18 2014 -0400
+++ b/Python/ceval.c	Sun Apr 13 22:54:20 2014 -0400
@@ -1926,7 +1926,7 @@ PyEval_EvalFrameEx(PyFrameObject *f, int
                 if (v == Py_None)
                     retval = Py_TYPE(reciever)->tp_iternext(reciever);
                 else
-                    retval = _PyObject_CallMethodId(reciever, &PyId_send, "O", v);
+                    retval = _PyObject_CallMethodId(reciever, &PyId_send, "(O)", v);
             }
             Py_DECREF(v);
             if (retval == NULL) {