diff --git a/runtime/syntax/ist.vim b/runtime/syntax/ist.vim
index fd0005e..131d833 100644
--- a/runtime/syntax/ist.vim
+++ b/runtime/syntax/ist.vim
@@ -1,7 +1,7 @@
 " Vim syntax file
 " Language:	Makeindex style file, *.ist
 " Maintainer:	Peter Meszaros <pmeszaros@effice.hu>
-" Last Change:	May 4, 2001
+" Last Change:	2012 Jan 08 by Thilo Six
 
 " For version 5.x: Clear all syntax items
 " For version 6.x: Quit when a syntax file was already loaded
@@ -11,6 +11,9 @@
   finish
 endif
 
+let s:cpo_save = &cpo
+set cpo&vim
+
 if version >= 600
   setlocal iskeyword=$,@,48-57,_
 else
@@ -67,4 +70,6 @@
 
 let b:current_syntax = "ist"
 
+let &cpo = s:cpo_save
+unlet s:cpo_save
 " vim: ts=8 sw=2