diff -r 9897babc1fb5 -r b3abdb3d819e hgext3rd/topic/__init__.py
--- a/hgext3rd/topic/__init__.py	Mon Sep 04 12:19:49 2017 +0200
+++ b/hgext3rd/topic/__init__.py	Mon Sep 04 12:23:03 2017 +0200
@@ -135,7 +135,7 @@
         # XXX we might want to include t0 here,
         # however t0 is related to  'currenttopic' which has no place here.
         return None
-    revlist = stack.getstack(self._repo, topic=topic)
+    revlist = stack.stack(self._repo, topic=topic)
     try:
         return revlist.index(self.rev())
     except IndexError:
@@ -154,12 +154,12 @@
         tname = topic = repo.currenttopic
         if not tname:
             raise error.Abort(_('cannot resolve "%s": no active topic') % name)
-        revs = list(stack.getstack(repo, topic=topic))
+        revs = list(stack.stack(repo, topic=topic))
     elif branchrev.match(name):
         ttype = 'branch'
         idx = int(name[1:])
         tname = branch = repo[None].branch()
-        revs = list(stack.getstack(repo, branch=branch))
+        revs = list(stack.stack(repo, branch=branch))
 
     if revs is not None:
         try: