diff -r 52305554fd6e -r 013fcd112f13 mercurial/extensions.py
--- a/mercurial/extensions.py	Sat Feb 09 16:48:21 2013 +0100
+++ b/mercurial/extensions.py	Sat Feb 09 11:00:42 2013 +0100
@@ -11,7 +11,7 @@
 
 _extensions = {}
 _order = []
-_ignore = ['hbisect', 'bookmarks', 'parentrevspec']
+_ignore = ['hbisect', 'bookmarks', 'parentrevspec', 'interhg']
 
 def extensions():
     for name in _order: