diff -r 410b7153480a -r 093af1c7d58d hgext3rd/topic/destination.py
--- a/hgext3rd/topic/destination.py	Tue Aug 30 14:10:16 2016 -0700
+++ b/hgext3rd/topic/destination.py	Tue Aug 30 15:15:05 2016 -0700
@@ -19,7 +19,7 @@
     else:
         # XXX: using only the max here is flacky. That code should eventually
         # be updated to take care of the whole sourceset.
-       p1 =  repo[max(sourceset)]
+       p1 = repo[max(sourceset)]
     top = p1.topic()
     if top:
         revs = repo.revs('topic(%s) - obsolete()', top)