--- a/mercurial/commands.py	Thu Jun 24 15:18:47 2010 +0100
+++ b/mercurial/commands.py	Fri Jun 25 13:47:28 2010 -0500
@@ -3745,7 +3745,8 @@
         for fname in fnames:
             f = url.open(ui, fname)
             gen = changegroup.readbundle(f, fname)
-            modheads = repo.addchangegroup(gen, 'unbundle', 'bundle:' + fname)
+            modheads = repo.addchangegroup(gen, 'unbundle', 'bundle:' + fname,
+                                           lock=lock)
     finally:
         lock.release()