Index: contrib/bazaar/mbprotect/__init__.py
===================================================================
--- contrib/bazaar/mbprotect/__init__.py	(revision d4112ba890bb5b18f3a58301c0de0d287cfee237)
+++ contrib/bazaar/mbprotect/__init__.py	(revision 33c29521d96b892e096419a2fd8beb867e2596f6)
@@ -44,4 +44,5 @@
 import bzrlib.branch
 from bzrlib.errors import TipChangeRejected
+from bzrlib import revision as _mod_revision
 
 def iter_reverse_revision_history(repository, revision_id):