diff --git a/Include/object.h b/Include/object.h
index b3f18d7af76..4ab8fde7dfa 100644
--- a/Include/object.h
+++ b/Include/object.h
@@ -268,6 +268,7 @@ extern int PyObject_SetAttrString Py_PROTO((PyObject *, char *, PyObject *));
 extern int PyObject_HasAttrString Py_PROTO((PyObject *, char *));
 extern PyObject *PyObject_GetAttr Py_PROTO((PyObject *, PyObject *));
 extern int PyObject_SetAttr Py_PROTO((PyObject *, PyObject *, PyObject *));
+extern int PyObject_HasAttr Py_PROTO((PyObject *, PyObject *));
 extern long PyObject_Hash Py_PROTO((PyObject *));
 extern int PyObject_IsTrue Py_PROTO((PyObject *));
 extern int PyCallable_Check Py_PROTO((PyObject *));