diff -r 204131131766 -r df41c7be16d6 mercurial/changelog.py
--- a/mercurial/changelog.py	Fri Aug 21 16:12:24 2015 -0700
+++ b/mercurial/changelog.py	Fri Aug 28 11:14:24 2015 +0900
@@ -18,7 +18,6 @@
     encoding,
     error,
     revlog,
-    revset,
     util,
 )
 
@@ -186,10 +185,7 @@
         return self._nodecache
 
     def reachableroots(self, minroot, heads, roots, includepath=False):
-        rroots = self.index.reachableroots2(minroot, heads, roots, includepath)
-        rroots = revset.baseset(rroots)
-        rroots.sort()
-        return rroots
+        return self.index.reachableroots2(minroot, heads, roots, includepath)
 
     def headrevs(self):
         if self.filteredrevs: