diff --git a/hgext/narrow/narrowrevlog.py b/hgext/narrow/narrowrevlog.py
--- a/hgext/narrow/narrowrevlog.py
+++ b/hgext/narrow/narrowrevlog.py
@@ -117,8 +117,6 @@
         # at least some push operations. This will be used to wrap/exclude the
         # child directories when using treemanifests.
         def dirlog(self, d):
-            if d and not d.endswith('/'):
-                d = d + '/'
             if not repo.narrowmatch().visitdir(d[:-1] or '.'):
                 return excludedmanifestrevlog(d)
             result = super(narrowmanifestrevlog, self).dirlog(d)
diff --git a/mercurial/cmdutil.py b/mercurial/cmdutil.py
--- a/mercurial/cmdutil.py
+++ b/mercurial/cmdutil.py
@@ -1058,6 +1058,8 @@
             if 'treemanifest' not in repo.requirements:
                 raise error.Abort(_("--dir can only be used on repos with "
                                    "treemanifest enabled"))
+            if not dir.endswith('/'):
+                dir = dir + '/'
             dirlog = repo.manifestlog._revlog.dirlog(dir)
             if len(dirlog):
                 r = dirlog
diff --git a/mercurial/manifest.py b/mercurial/manifest.py
--- a/mercurial/manifest.py
+++ b/mercurial/manifest.py
@@ -1160,8 +1160,6 @@
 
         if dir:
             assert self._treeondisk, 'opts is %r' % opts
-            if not dir.endswith('/'):
-                dir = dir + '/'
 
         if indexfile is None:
             indexfile = '00manifest.i'