--- a/mercurial/store.py	Wed Aug 24 05:42:41 2011 -0400
+++ b/mercurial/store.py	Thu Aug 25 20:21:04 2011 -0400
@@ -345,7 +345,7 @@
         fp = self.opener('fncache', mode='wb', atomictemp=True)
         for p in self.entries:
             fp.write(encodedir(p) + '\n')
-        fp.rename()
+        fp.close()
         self._dirty = False
 
     def add(self, fn):