--- a/hgext3rd/topic/__init__.py	Sat Oct 14 20:17:25 2017 +0530
+++ b/hgext3rd/topic/__init__.py	Fri Oct 13 06:02:56 2017 +0530
@@ -524,6 +524,7 @@
         topic = repo.currenttopic
     if topic is None:
         branch = repo[None].branch()
+    compat.startpager(ui, 'stack')
     return stack.showstack(ui, repo, branch=branch, topic=topic, opts=opts)
 
 @command('debugcb|debugconvertbookmark', [