diff --git a/Objects/abstract.c b/Objects/abstract.c
index 5247824..d4cba74 100644
--- a/Objects/abstract.c
+++ b/Objects/abstract.c
@@ -1453,7 +1453,7 @@
 int
 PySequence_Check(PyObject *s)
 {
-	if (PyObject_IsInstance(s, (PyObject *)&PyDict_Type))
+	if (PyDict_Check(s))
 		return 0;
 	return s != NULL && s->ob_type->tp_as_sequence &&
 		s->ob_type->tp_as_sequence->sq_item != NULL;