diff -r 42e71f5852ee -r 4be845e3932c mercurial/subrepo.py
--- a/mercurial/subrepo.py	Mon Oct 17 14:27:34 2011 +0200
+++ b/mercurial/subrepo.py	Mon Oct 17 16:45:19 2011 +0200
@@ -418,6 +418,7 @@
                                % (inst, subrelpath(self)))
 
     def archive(self, ui, archiver, prefix):
+        self._get(self._state + ('hg',))
         abstractsubrepo.archive(self, ui, archiver, prefix)
 
         rev = self._state[1]