diff --git a/hgext/progress.py b/hgext/progress.py
deleted file mode 100644
--- a/hgext/progress.py
+++ /dev/null
@@ -1,17 +0,0 @@
-# progress.py show progress bars for some actions
-#
-# Copyright (C) 2010 Augie Fackler <durin42@gmail.com>
-#
-# This software may be used and distributed according to the terms of the
-# GNU General Public License version 2 or any later version.
-
-"""show progress bars for some actions (DEPRECATED)
-
-This extension has been merged into core, you can remove it from your config.
-See hg help config.progress for configuration options.
-"""
-# Note for extension authors: ONLY specify testedwith = 'internal' for
-# extensions which SHIP WITH MERCURIAL. Non-mainline extensions should
-# be specifying the version(s) of Mercurial they are tested with, or
-# leave the attribute unspecified.
-testedwith = 'internal'
diff --git a/mercurial/extensions.py b/mercurial/extensions.py
--- a/mercurial/extensions.py
+++ b/mercurial/extensions.py
@@ -24,8 +24,8 @@ from . import (
 _extensions = {}
 _aftercallbacks = {}
 _order = []
-#  former extensions now in core - we ignore these if found in hgrc
-_builtin = set(['hbisect', 'bookmarks', 'parentrevspec', 'interhg', 'inotify'])
+_builtin = set(['hbisect', 'bookmarks', 'parentrevspec', 'progress', 'interhg',
+                'inotify'])
 
 def extensions(ui=None):
     if ui: