diff --git a/Objects/descrobject.c b/Objects/descrobject.c
index 6c99f9b..7590185 100644
--- a/Objects/descrobject.c
+++ b/Objects/descrobject.c
@@ -265,13 +265,14 @@
 // same to methoddescr_call(), but use FASTCALL convention.
 PyObject *
 _PyMethodDescr_FastCallKeywords(PyObject *descrobj,
-                                PyObject *const *args, Py_ssize_t nargs,
+                                PyObject *const *args, size_t nargsf,
                                 PyObject *kwnames)
 {
     assert(Py_TYPE(descrobj) == &PyMethodDescr_Type);
     PyMethodDescrObject *descr = (PyMethodDescrObject *)descrobj;
     PyObject *self, *result;
 
+    Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);
     /* Make sure that the first argument is acceptable as 'self' */
     if (nargs < 1) {
         PyErr_Format(PyExc_TypeError,
@@ -542,7 +543,7 @@
     sizeof(PyMethodDescrObject),
     0,
     (destructor)descr_dealloc,                  /* tp_dealloc */
-    0,                                          /* tp_print */
+    offsetof(PyMethodDescrObject, vectorcall),  /* tp_vectorcall_offset */
     0,                                          /* tp_getattr */
     0,                                          /* tp_setattr */
     0,                                          /* tp_reserved */
@@ -557,6 +558,7 @@
     0,                                          /* tp_setattro */
     0,                                          /* tp_as_buffer */
     Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
+    _Py_TPFLAGS_HAVE_VECTORCALL |
     Py_TPFLAGS_METHOD_DESCRIPTOR,               /* tp_flags */
     0,                                          /* tp_doc */
     descr_traverse,                             /* tp_traverse */
@@ -752,8 +754,10 @@
 
     descr = (PyMethodDescrObject *)descr_new(&PyMethodDescr_Type,
                                              type, method->ml_name);
-    if (descr != NULL)
+    if (descr != NULL) {
         descr->d_method = method;
+        descr->vectorcall = &_PyMethodDescr_FastCallKeywords;
+    }
     return (PyObject *)descr;
 }