--- a/hgext3rd/topic/stack.py	Mon Jun 19 18:46:30 2017 +0200
+++ b/hgext3rd/topic/stack.py	Mon Jun 19 10:33:36 2017 +0200
@@ -78,7 +78,7 @@
             # "base" is kind of a "ghost" entry
             # skip other label for them (no current, no unstable)
             states = ['base']
-        elif repo.revs('%d and unstable()', ctx.rev()):
+        elif ctx.unstable():
             # current revision can be unstable also, so in that case show both
             # the states and the symbol '@' (issue5553)
             if iscurrentrevision: