--- a/mercurial/changelog.py	Tue Aug 18 16:40:10 2015 -0400
+++ b/mercurial/changelog.py	Fri Aug 14 15:43:29 2015 +0900
@@ -187,7 +187,7 @@
 
     def reachableroots(self, minroot, heads, roots, includepath=False):
         return revset.baseset(sorted(
-            self.index.reachableroots(minroot, heads, roots, includepath)))
+            self.index.reachableroots2(minroot, heads, roots, includepath)))
 
     def headrevs(self):
         if self.filteredrevs: