--- a/mercurial/hgweb/webcommands.py	Sun Dec 21 14:34:07 2014 -0800
+++ b/mercurial/hgweb/webcommands.py	Sat Jan 03 17:50:21 2015 +0800
@@ -379,7 +379,7 @@
                 diff=diffs,
                 rev=ctx.rev(),
                 node=ctx.hex(),
-                parent=webutil.parents(ctx),
+                parent=tuple(webutil.parents(ctx)),
                 child=webutil.children(ctx),
                 basenode=basectx.hex(),
                 changesettag=showtags,