diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -1243,6 +1243,8 @@ class localrepository(repo.repository):
             self.hook('pretxncommit', throw=True, node=hex(n), parent1=xp1,
                       parent2=xp2, pending=p)
             self.changelog.finalize(trp)
+            # ensure the new commit is 1-phase
+            phases.retractboundary(self, 1, [n])
             tr.close()
 
             if self._branchcache:
diff --git a/tests/test-fncache.t b/tests/test-fncache.t
--- a/tests/test-fncache.t
+++ b/tests/test-fncache.t
@@ -74,6 +74,7 @@ Non store repo:
   .hg/data/tst.d.hg/foo.i
   .hg/dirstate
   .hg/last-message.txt
+  .hg/phaseroots
   .hg/requires
   .hg/undo
   .hg/undo.bookmarks
@@ -103,6 +104,7 @@ Non fncache repo:
   .hg/store/data
   .hg/store/data/tst.d.hg
   .hg/store/data/tst.d.hg/_foo.i
+  .hg/store/phaseroots
   .hg/store/undo
   .hg/store/undo.phaseroots
   .hg/undo.bookmarks
diff --git a/tests/test-hardlinks.t b/tests/test-hardlinks.t
--- a/tests/test-hardlinks.t
+++ b/tests/test-hardlinks.t
@@ -47,6 +47,7 @@ Prepare repo r1:
   1 r1/.hg/store/data/d1/f2.i
   1 r1/.hg/store/data/f1.i
   1 r1/.hg/store/fncache
+  1 r1/.hg/store/phaseroots
   1 r1/.hg/store/undo
   1 r1/.hg/store/undo.phaseroots
 
@@ -76,6 +77,7 @@ Repos r1 and r2 should now contain hardl
   2 r1/.hg/store/data/d1/f2.i
   2 r1/.hg/store/data/f1.i
   2 r1/.hg/store/fncache
+  1 r1/.hg/store/phaseroots
   1 r1/.hg/store/undo
   1 r1/.hg/store/undo.phaseroots
 
@@ -115,6 +117,7 @@ Create a non-inlined filelog in r3:
   1 r3/.hg/store/data/d1/f2.i
   1 r3/.hg/store/data/f1.i
   1 r3/.hg/store/fncache
+  1 r3/.hg/store/phaseroots
   1 r3/.hg/store/undo
   1 r3/.hg/store/undo.phaseroots
 
@@ -199,6 +202,7 @@ r4 has hardlinks in the working dir (not
   2 r4/.hg/store/data/d1/f2.i
   2 r4/.hg/store/data/f1.i
   2 r4/.hg/store/fncache
+  2 r4/.hg/store/phaseroots
   2 r4/.hg/store/undo
   2 r4/.hg/store/undo.phaseroots
   2 r4/.hg/undo.bookmarks
@@ -229,6 +233,7 @@ Update back to revision 11 in r4 should 
   2 r4/.hg/store/data/d1/f2.i
   2 r4/.hg/store/data/f1.i
   2 r4/.hg/store/fncache
+  2 r4/.hg/store/phaseroots
   2 r4/.hg/store/undo
   2 r4/.hg/store/undo.phaseroots
   2 r4/.hg/undo.bookmarks
diff --git a/tests/test-inherit-mode.t b/tests/test-inherit-mode.t
--- a/tests/test-inherit-mode.t
+++ b/tests/test-inherit-mode.t
@@ -76,6 +76,7 @@ new directories are setgid
   00660 ./.hg/store/data/dir/bar.i
   00660 ./.hg/store/data/foo.i
   00660 ./.hg/store/fncache
+  00660 ./.hg/store/phaseroots
   00660 ./.hg/store/undo
   00660 ./.hg/store/undo.phaseroots
   00660 ./.hg/undo.bookmarks
diff --git a/tests/test-phases.t b/tests/test-phases.t
--- a/tests/test-phases.t
+++ b/tests/test-phases.t
@@ -7,4 +7,4 @@
   $ hg ci -m 'first'
 
   $ hglog
-  0 0 first
+  0 1 first