Index: Objects/setobject.c
===================================================================
--- Objects/setobject.c	(revision 82374)
+++ Objects/setobject.c	(working copy)
@@ -1935,14 +1935,19 @@
 static PyObject *
 set_reduce(PySetObject *so)
 {
-    PyObject *keys=NULL, *args=NULL, *result=NULL, *dict=NULL;
+    PyObject *args=NULL, *result=NULL, *dict=NULL;
 
-    keys = PySequence_List((PyObject *)so);
-    if (keys == NULL)
-        goto done;
-    args = PyTuple_Pack(1, keys);
+    if (PySet_GET_SIZE(so) == 0)
+        args = PyTuple_New(0);
+    else {
+        PyObject *keys = PySequence_List((PyObject *)so);
+        if (keys == NULL)
+            return NULL;
+        args = PyTuple_Pack(1, keys);
+        Py_DECREF(keys);
+    }
     if (args == NULL)
-        goto done;
+        return NULL;
     dict = PyObject_GetAttrString((PyObject *)so, "__dict__");
     if (dict == NULL) {
         PyErr_Clear();
@@ -1950,10 +1955,8 @@
         Py_INCREF(dict);
     }
     result = PyTuple_Pack(3, Py_TYPE(so), args, dict);
-done:
-    Py_XDECREF(args);
-    Py_XDECREF(keys);
-    Py_XDECREF(dict);
+    Py_DECREF(args);
+    Py_DECREF(dict);
     return result;
 }