--- a/mercurial/repair.py	Wed Apr 08 09:38:09 2015 -0700
+++ b/mercurial/repair.py	Thu Apr 09 16:25:48 2015 -0400
@@ -42,7 +42,7 @@
     name = "%s/%s-%s-%s.hg" % (backupdir, short(node), totalhash[:8], suffix)
 
     if usebundle2:
-        bundletype = "HG2Y"
+        bundletype = "HG20"
     elif compress:
         bundletype = "HG10BZ"
     else: