diff --git a/mercurial/context.py b/mercurial/context.py
--- a/mercurial/context.py
+++ b/mercurial/context.py
@@ -198,7 +198,7 @@ class changectx(object):
             if match(fn):
                 yield fn
         for fn in sorted(fset):
-            if match.bad(fn, 'No such file in rev ' + str(self)) and match(fn):
+            if match.bad(fn, _('No such file in rev %s') % self) and match(fn):
                 yield fn
 
     def sub(self, path):