diff --git a/runtime/syntax/ayacc.vim b/runtime/syntax/ayacc.vim
index be91e2f..fedd0e8 100644
--- a/runtime/syntax/ayacc.vim
+++ b/runtime/syntax/ayacc.vim
@@ -1,7 +1,7 @@
 " Vim syntax file
 " Language:	AYacc
 " Maintainer:	Mathieu Clabaut <mathieu.clabaut@free.fr>
-" LastChange:	02 May 2001
+" LastChange:	2011 Dec 25
 " Original:	Yacc, maintained by Dr. Charles E. Campbell, Jr.
 " Comment:	     Replaced sourcing c.vim file by ada.vim and rename yacc*
 "		in ayacc*
@@ -22,6 +22,9 @@
    unlet b:current_syntax
 endif
 
+let s:cpo_save = &cpo
+set cpo&vim
+
 " Clusters
 syn cluster	ayaccActionGroup	contains=ayaccDelim,cInParen,cTodo,cIncluded,ayaccDelim,ayaccCurlyError,ayaccUnionCurly,ayaccUnion,cUserLabel,cOctalZero,cCppOut2,cCppSkip,cErrInBracket,cErrInParen,cOctalError
 syn cluster	ayaccUnionGroup	contains=ayaccKey,cComment,ayaccCurly,cType,cStructure,cStorageClass,ayaccUnionCurly
@@ -83,4 +86,6 @@
 
 let b:current_syntax = "ayacc"
 
+let &cpo = s:cpo_save
+unlet s:cpo_save
 " vim: ts=15