diff --git a/Lib/test/test_sys.py b/Lib/test/test_sys.py
index 4563374..2062838 100644
--- a/Lib/test/test_sys.py
+++ b/Lib/test/test_sys.py
@@ -567,6 +567,9 @@
         # string
         self.check_sizeof('', h + l + self.align(i + 1))
         self.check_sizeof('abc', h + l + self.align(i + 1) + 3)
+        # tuple
+        self.check_sizeof((), h)
+        self.check_sizeof((1,2,3), h + 3*p)
 
 
 def test_main():
diff --git a/Objects/tupleobject.c b/Objects/tupleobject.c
index e9cb3ef..79d7553 100644
--- a/Objects/tupleobject.c
+++ b/Objects/tupleobject.c
@@ -708,13 +708,25 @@
 	
 }
 
+static PyObject *
+tuple_sizeof(PyTupleObject *self)
+{
+	Py_ssize_t res;
+
+	res = PyTuple_Type.tp_basicsize + Py_SIZE(self) * sizeof(PyObject *);
+	return PyInt_FromSsize_t(res);
+}
+
 PyDoc_STRVAR(index_doc,
 "T.index(value, [start, [stop]]) -> integer -- return first index of value");
 PyDoc_STRVAR(count_doc,
 "T.count(value) -> integer -- return number of occurrences of value");
+PyDoc_STRVAR(sizeof_doc,
+"T.__sizeof__() -- size of T in memory, in bytes");
 
 static PyMethodDef tuple_methods[] = {
 	{"__getnewargs__",	(PyCFunction)tuple_getnewargs,	METH_NOARGS},
+	{"__sizeof__",	(PyCFunction)tuple_sizeof, METH_NOARGS, sizeof_doc},
 	{"index",	(PyCFunction)tupleindex,  METH_VARARGS, index_doc},
 	{"count",	(PyCFunction)tuplecount,  METH_O, count_doc},
 	{NULL,		NULL}		/* sentinel */