diff -r 9a5c2ecd1158 -r 64c6a0d4d4bd mercurial/store.py
--- a/mercurial/store.py	Sun Sep 16 11:41:02 2012 +0200
+++ b/mercurial/store.py	Mon Sep 17 08:58:35 2012 +0200
@@ -348,7 +348,7 @@
     def _write(self, files, atomictemp):
         fp = self.opener('fncache', mode='wb', atomictemp=atomictemp)
         if files:
-            fp.write('\n'.join(map(encodedir, files)) + '\n')
+            fp.write(encodedir('\n'.join(files) + '\n'))
         fp.close()
         self._dirty = False