diff --git a/Lib/python/builtin.swg b/Lib/python/builtin.swg
index 16487b2a6..0e03d22aa 100644
--- a/Lib/python/builtin.swg
+++ b/Lib/python/builtin.swg
@@ -365,26 +365,35 @@ SwigPyObjectType(void) {
 
 #if PY_VERSION_HEX < 0x030B00A5
 SWIGINTERN PyDescrObject *
-PyDescr_New(PyTypeObject *descr_type, PyTypeObject *type, const char *name) {
-
-    assert(name != NULL);
-    assert(name != NULL);
+PyDescr_New(PyTypeObject *descr_type, PyTypeObject *type, const char *name)
+{
+  assert(descr_type != NULL);
+  assert(type != NULL);
+  assert(name != NULL);
 
-    PyObject *name_obj = PyUnicode_InternFromString(name);
-    if (name_obj == NULL) {
-        return NULL;
-    }
+  PyObject *name_obj;
+#if PY_MAJOR_VERSION >= 3
+  name_obj = PyUnicode_InternFromString(name);
+#else
+  name_obj = PyString_InternFromString(name);
+#endif
+  if (name_obj == NULL) {
+    return NULL;
+  }
 
-    PyDescrObject *descr = (PyDescrObject *)PyType_GenericAlloc(descr_type, 0);
-    if (descr == NULL) {
-        return NULL;
-    }
+  PyDescrObject *descr = (PyDescrObject *)PyType_GenericAlloc(descr_type, 0);
+  if (descr == NULL) {
+    Py_DECREF(name_obj);
+    return NULL;
+  }
 
-    Py_XINCREF(type)
-    descr->d_type = type;
-    descr->d_name = name_obj;
-    descr->d_qualname = NULL;
-    return descr;
+  descr->d_type = (PyTypeObject*)Py_NewRef(type);
+  descr->d_name = name_obj;
+  // PyDescrObject.d_qualname was added to Python 3.3.0a1
+#if PY_VERSION_HEX >= 0x030300A1
+  descr->d_qualname = NULL;
+#endif
+  return descr;
 }
 #endif