--- a/contrib/perf.py	Mon May 15 18:55:58 2017 -0700
+++ b/contrib/perf.py	Mon May 15 19:37:11 2017 -0700
@@ -865,7 +865,9 @@
             dist = -1 * dist
 
         for x in xrange(beginrev, endrev, dist):
-            rl.revision(x)
+            # Old revisions don't support passing int.
+            n = rl.node(x)
+            rl.revision(n)
 
     timer, fm = gettimer(ui, opts)
     timer(d)