diff --git a/runtime/ftplugin/lisp.vim b/runtime/ftplugin/lisp.vim
index 589a600..dcc248c 100644
--- a/runtime/ftplugin/lisp.vim
+++ b/runtime/ftplugin/lisp.vim
@@ -4,7 +4,7 @@
 " URL:		 http://sites.google.com/site/khorser/opensource/vim
 " Original author:    Dorai Sitaram <ds26@gte.com>
 " Original URL:		 http://www.ccs.neu.edu/~dorai/vimplugins/vimplugins.html
-" Last Change:   Jan 9, 2012
+" Last Change:   Mar 5, 2012
 
 " Only do this when not done yet for this buffer
 if exists("b:did_ftplugin")
@@ -24,3 +24,5 @@
 " e.g. insertion of ;;; and ;; on normal "O" or "o" when staying in comment
 setl comments^=:;;;,:;;,sr:#\|,mb:\|,ex:\|#
 setl formatoptions+=croql
+
+let b:undo_ftplugin = "setlocal comments< define< formatoptions< iskeyword< lisp<"