Update runtime files
diff --git a/runtime/ftplugin/nsis.vim b/runtime/ftplugin/nsis.vim
index 1a35127..3dc0d63 100644
--- a/runtime/ftplugin/nsis.vim
+++ b/runtime/ftplugin/nsis.vim
@@ -3,7 +3,7 @@
 " Maintainer:		Ken Takata
 " URL:			https://github.com/k-takata/vim-nsis
 " Previous Maintainer:	Nikolai Weibull <now@bitwi.se>
-" Last Change:		2018-01-26
+" Last Change:		2021-10-18
 
 if exists("b:did_ftplugin")
   finish
@@ -15,7 +15,6 @@
 let b:did_ftplugin = 1
 
 let b:undo_ftplugin = "setl com< cms< fo< def< inc<"
-      \ " | unlet! b:match_ignorecase b:match_words"
 
 setlocal comments=s1:/*,mb:*,ex:*/,b:#,:; commentstring=;\ %s
 setlocal formatoptions-=t formatoptions+=croql
@@ -37,6 +36,7 @@
 	\ '\${MementoSection}:\${MementoSectionEnd},' .
 	\ '!if\%(\%(macro\)\?n\?def\)\?\>:!else\>:!endif\>,' .
 	\ '!macro\>:!macroend\>'
+  let b:undo_ftplugin .= " | unlet! b:match_ignorecase b:match_words"
 endif
 
 let &cpo = s:cpo_save