diff -r 616a455b02ca -r c1ca47204590 mercurial/commands.py
--- a/mercurial/commands.py	Wed Aug 06 01:54:19 2014 -0700
+++ b/mercurial/commands.py	Tue Aug 05 23:52:21 2014 -0700
@@ -4585,7 +4585,7 @@
             olddata = repo._phasecache.getphaserevs(repo)[:]
             phases.advanceboundary(repo, tr, targetphase, nodes)
             if opts['force']:
-                phases.retractboundary(repo, targetphase, nodes)
+                phases.retractboundary(repo, tr, targetphase, nodes)
             tr.close()
         finally:
             if tr is not None: