diff -r 75dc64c8c22b Objects/typeobject.c
--- a/Objects/typeobject.c	Wed Jun 01 08:17:27 2016 +0000
+++ b/Objects/typeobject.c	Sun Jun 05 13:07:21 2016 +0800
@@ -2580,8 +2580,10 @@
         tmp = PyStaticMethod_New(tmp);
         if (tmp == NULL)
             goto error;
-        if (_PyDict_SetItemId(dict, &PyId___new__, tmp) < 0)
+        if (_PyDict_SetItemId(dict, &PyId___new__, tmp) < 0) {
+            Py_DECREF(tmp);
             goto error;
+        }
         Py_DECREF(tmp);
     }