diff --git a/runtime/indent/pascal.vim b/runtime/indent/pascal.vim
index c7955d6..1f39fd1 100644
--- a/runtime/indent/pascal.vim
+++ b/runtime/indent/pascal.vim
@@ -2,7 +2,7 @@
 " Language:    Pascal
 " Maintainer:  Neil Carter <n.carter@swansea.ac.uk>
 " Created:     2004 Jul 13
-" Last Change: 2017 Jun 13
+" Last Change: 2021 Jul 01
 "
 " This is version 2.0, a complete rewrite.
 "
@@ -20,6 +20,8 @@
 setlocal indentkeys+==program,==function,==procedure,==object,==private
 setlocal indentkeys+==record,==if,==else,==case
 
+let b:undo_indent = "setl indentkeys< indentexpr<"
+
 if exists("*GetPascalIndent")
 	finish
 endif