diff -r d34058dd3246 -r 616a455b02ca mercurial/commands.py
--- a/mercurial/commands.py	Wed Aug 06 00:54:37 2014 -0700
+++ b/mercurial/commands.py	Wed Aug 06 01:54:19 2014 -0700
@@ -4583,7 +4583,7 @@
                 raise util.Abort(_('empty revision set'))
             nodes = [repo[r].node() for r in revs]
             olddata = repo._phasecache.getphaserevs(repo)[:]
-            phases.advanceboundary(repo, targetphase, nodes)
+            phases.advanceboundary(repo, tr, targetphase, nodes)
             if opts['force']:
                 phases.retractboundary(repo, targetphase, nodes)
             tr.close()