diff --git a/runtime/indent/c.vim b/runtime/indent/c.vim
index 135251d..e224382 100644
--- a/runtime/indent/c.vim
+++ b/runtime/indent/c.vim
@@ -1,7 +1,7 @@
 " Vim indent file
 " Language:	C
 " Maintainer:	Bram Moolenaar <Bram@vim.org>
-" Last Change:	2001 Jun 12
+" Last Change:	2005 Mar 27
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
@@ -11,3 +11,5 @@
 
 " C indenting is built-in, thus this is very simple
 setlocal cindent
+
+let b:undo_indent = "setl cin<"