diff --git a/runtime/ftplugin/dosbatch.vim b/runtime/ftplugin/dosbatch.vim
index 6e581e7..7662896 100644
--- a/runtime/ftplugin/dosbatch.vim
+++ b/runtime/ftplugin/dosbatch.vim
@@ -1,7 +1,7 @@
 " Vim filetype plugin file
 " Language:    MS-DOS .bat files
 " Maintainer:  Mike Williams <mrw@eandem.co.uk>
-" Last Change: 27th May 2009
+" Last Change: 24th April 2012
 
 " Only do this when not done yet for this buffer
 if exists("b:did_ftplugin")
@@ -19,3 +19,6 @@
 if has("gui_win32") && !exists("b:browsefilter")
   let b:browsefilter = "DOS Batch Files (*.bat, *.cmd)\t*.bat;*.cmd\nAll Files (*.*)\t*.*\n"
 endif
+
+let b:undo_ftplugin = "setlocal comments< formatoptions<"
+    \ . "| unlet! b:browsefiler"