diff --git a/Objects/typeobject.c b/Objects/typeobject.c
index ac4dc1da4411dc..b23d44412a3f08 100644
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -4737,10 +4737,10 @@ object_set_class(PyObject *self, PyObject *value, void *closure)
*/
if (!(PyType_IsSubtype(newto, &PyModule_Type) &&
PyType_IsSubtype(oldto, &PyModule_Type)) &&
- (!(newto->tp_flags & Py_TPFLAGS_HEAPTYPE) ||
- !(oldto->tp_flags & Py_TPFLAGS_HEAPTYPE))) {
+ (_PyType_HasFeature(newto, Py_TPFLAGS_IMMUTABLETYPE) ||
+ _PyType_HasFeature(oldto, Py_TPFLAGS_IMMUTABLETYPE))) {
PyErr_Format(PyExc_TypeError,
- "__class__ assignment only supported for heap types "
+ "__class__ assignment only supported for mutable types "
"or ModuleType subclasses");
return -1;
}
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