diff --git a/Objects/typeobject.c b/Objects/typeobject.c
index d6e4199204e..7ff3804b2b7 100644
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -1137,7 +1137,7 @@ type_call(PyTypeObject *type, PyObject *args, PyObject *kwds)
 
     /* If the returned object is not an instance of type,
        it won't be initialized. */
-    if (!PyType_IsSubtype(Py_TYPE(obj), type))
+    if (!PyObject_TypeCheck(obj, type))
         return obj;
 
     type = Py_TYPE(obj);
@@ -1531,10 +1531,6 @@ PyType_IsSubtype(PyTypeObject *a, PyTypeObject *b)
 {
     PyObject *mro;
 
-    if (a == b) {
-        return 1;
-    }
-
     mro = a->tp_mro;
     if (mro != NULL) {
         /* Deal with multiple inheritance without recursion