diff --git a/treemanifest/__init__.py b/treemanifest/__init__.py
--- a/treemanifest/__init__.py
+++ b/treemanifest/__init__.py
@@ -75,6 +75,7 @@
     extensions,
     localrepo,
     manifest,
+    match,
     mdiff,
     phases,
     policy,
@@ -366,6 +367,7 @@
         self._dirmancache[''] = util.lrucachedict(cachesize)
 
         self.cachesize = cachesize
+        self._narrowmatch = match.always('', '')
 
 class treeonlymanifestlog(object):
     def __init__(self, opener):