diff -r 4e451d1359de -r 5eb3541f907e mercurial/transaction.py
--- a/mercurial/transaction.py	Mon Jan 05 12:39:09 2015 -0800
+++ b/mercurial/transaction.py	Mon Jan 05 12:44:15 2015 -0800
@@ -206,7 +206,7 @@
         if vfs.exists(file):
             filepath = vfs.join(file)
             backuppath = vfs.join(backupfile)
-            util.copyfiles(filepath, backuppath, hardlink=hardlink)
+            util.copyfile(filepath, backuppath, hardlink=hardlink)
         else:
             backupfile = ''