diff --git a/runtime/ftplugin/basic.vim b/runtime/ftplugin/basic.vim
index a8f6b08..4399fbf 100644
--- a/runtime/ftplugin/basic.vim
+++ b/runtime/ftplugin/basic.vim
@@ -1,7 +1,7 @@
 " Vim filetype plugin file
 " Language:	BASIC (QuickBASIC 4.5)
 " Maintainer:	Doug Kearns <dougkearns@gmail.com>
-" Last Change:	2021 Mar 16
+" Last Change:	2022 Jun 22
 
 if exists("b:did_ftplugin")
   finish
@@ -15,6 +15,8 @@
 setlocal commentstring='\ %s
 setlocal formatoptions-=t formatoptions+=croql
 
+let b:undo_ftplugin = "setl fo< com< cms<"
+
 " TODO: support exit ... as middle matches?
 if exists("loaded_matchit") && !exists("b:match_words")
   let s:line_start	= '\%(^\s*\)\@<='
@@ -33,10 +35,11 @@
 		\     '\<while\>:\<wend\>,' ..
 		\     s:line_start .. 'if\%(.*\<then\s*\%($\|''\)\)\@=:\<\%(' .. s:line_start .. 'else\|elseif\)\>:\<end\s\+if\>,' ..
 		\     '\<lock\>:\<unlock\>'
-
   let b:match_skip = 'synIDattr(synID(line("."),col("."),1),"name") =~? "comment\\|string" || ' ..
 		\    'strpart(getline("."), 0, col(".") ) =~? "\\<exit\\s\\+"'
 
+  let b:undo_ftplugin ..= " | unlet! b:match_ignorecase b:match_skip b:match_words"
+
   unlet s:line_start s:not_end s:not_end_or_exit
 endif
 
@@ -44,12 +47,10 @@
   let b:browsefilter = "BASIC Source Files (*.bas)\t*.bas\n" ..
 		\      "BASIC Include Files (*.bi, *.bm)\t*.bi;*.bm\n" ..
 		\      "All Files (*.*)\t*.*\n"
+  let b:basic_set_browsefilter = 1
+  let b:undo_ftplugin ..= " | unlet! b:browsefilter b:basic_set_browsefilter"
 endif
 
-let b:undo_ftplugin = "setl fo< com< cms<" ..
-		\     " | unlet! b:match_ignorecase b:match_skip b:match_words" ..
-		\     " | unlet! b:browsefilter"
-
 let &cpo = s:cpo_save
 unlet s:cpo_save