--- a/boost/parameter/python.hpp
+++ b/boost/parameter/python.hpp
@@ -66,7 +66,11 @@ namespace boost { namespace parameter {
       
       if (Py_TYPE(&unspecified) == 0)
       {
+#if PY_VERSION_HEX >= 0x03090000
+          Py_SET_TYPE(&unspecified, &PyType_Type);
+#else
           Py_TYPE(&unspecified) = &PyType_Type;
+#endif
           PyType_Ready(&unspecified);
       }
       
--- a/libs/python/test/upcast.cpp
+++ b/libs/python/test/upcast.cpp
@@ -13,7 +13,7 @@ int main()
 {
     PyTypeObject o;
     Y y;
-    BOOST_TEST(&Py_REFCNT(boost::python::upcast<PyObject>(&o)) == &Py_REFCNT(&o));
-    BOOST_TEST(&Py_REFCNT(boost::python::upcast<PyObject>(&y)) == &Py_REFCNT(&y));
+    BOOST_TEST(Py_REFCNT(boost::python::upcast<PyObject>(&o)) == Py_REFCNT(&o));
+    BOOST_TEST(Py_REFCNT(boost::python::upcast<PyObject>(&y)) == Py_REFCNT(&y));
     return boost::report_errors();
 }
--- a/libs/python/test/pickle1.py
+++ b/libs/python/test/pickle1.py
@@ -10,7 +10,7 @@ r'''>>> import pickle1_ext
     >>> pickle1_ext.world.__name__
     'world'
     >>> pickle1_ext.world('Hello').__reduce__()
-    (<class 'pickle1_ext.world'>, ('Hello',))
+    (<class 'pickle1_ext.world'>, ('Hello',), None)
     >>> wd = pickle1_ext.world('California')
     >>> pstr = pickle.dumps(wd)
     >>> wl = pickle.loads(pstr)
--- a/libs/python/test/pickle4.py
+++ b/libs/python/test/pickle4.py
@@ -13,7 +13,7 @@ r'''>>> import pickle4_ext
     >>> pickle4_ext.world.__name__
     'world'
     >>> pickle4_ext.world('Hello').__reduce__()
-    (<class 'pickle4_ext.world'>, ('Hello',))
+    (<class 'pickle4_ext.world'>, ('Hello',), None)
     >>> wd = pickle4_ext.world('California')
     >>> pstr = pickle.dumps(wd)
     >>> wl = pickle.loads(pstr)