diff --git a/runtime/ftplugin/prolog.vim b/runtime/ftplugin/prolog.vim
index e5ab76d..eebbdab 100644
--- a/runtime/ftplugin/prolog.vim
+++ b/runtime/ftplugin/prolog.vim
@@ -1,13 +1,14 @@
 " Vim filetype plugin file
 " Language:         Prolog
 " Maintainer:       Nikolai Weibull <nikolai+work.vim@bitwi.se>
-" Latest Revision:  2005-06-29
+" Latest Revision:  2005-07-04
 
 if exists("b:did_ftplugin")
   finish
 endif
 let b:did_ftplugin = 1
 
-let b:undo_ftplugin = "setl com< cms<"
+let b:undo_ftplugin = "setl com< cms< fo<"
 
 setlocal comments=s1:/*,mb:*,ex:*/,:% commentstring=%\ %s
+setlocal formatoptions-=t formatoptions+=croql