diff --git a/mercurial/repair.py b/mercurial/repair.py
--- a/mercurial/repair.py
+++ b/mercurial/repair.py
@@ -6,7 +6,7 @@
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
-from mercurial import changegroup, bookmarks, phases
+from mercurial import changegroup, bookmarks
 from mercurial.node import short
 from mercurial.i18n import _
 import os
@@ -170,7 +170,3 @@ def strip(ui, repo, nodelist, backup="al
         raise
 
     repo.destroyed()
-
-    # remove potential unknown phase
-    # XXX using to_strip data would be faster
-    phases.filterunknown(repo)
diff --git a/tests/test-keyword.t b/tests/test-keyword.t
--- a/tests/test-keyword.t
+++ b/tests/test-keyword.t
@@ -558,6 +558,7 @@ Commit and show expansion in original an
   $ hg --debug commit -ma2c -d '1 0' -u 'User Name <user@example.com>'
   c
    c: copy a:0045e12f6c5791aac80ca6cbfd97709a88307292
+  removing unknown node 40a904bbbe4c from 1-phase boundary
   overwriting c expanding keywords
   committed changeset 2:25736cf2f5cbe41f6be4e6784ef6ecf9f3bbcc7d
   $ cat a c
@@ -722,6 +723,7 @@ Commit with multiline message and custom
 
   $ hg --debug commit -l log -d '2 0' -u 'User Name <user@example.com>'
   a
+  removing unknown node 40a904bbbe4c from 1-phase boundary
   overwriting a expanding keywords
   committed changeset 2:bb948857c743469b22bbf51f7ec8112279ca5d83
   $ rm log