diff --git a/runtime/indent/sass.vim b/runtime/indent/sass.vim
index d6dbf3a..8c0ecd0 100644
--- a/runtime/indent/sass.vim
+++ b/runtime/indent/sass.vim
@@ -1,7 +1,7 @@
 " Vim indent file
 " Language:	Sass
 " Maintainer:	Tim Pope <vimNOSPAM@tpope.org>
-" Last Change:	2017 Jun 13
+" Last Change:	2022 Mar 15
 
 if exists("b:did_indent")
   finish
@@ -12,6 +12,8 @@
 setlocal indentexpr=GetSassIndent()
 setlocal indentkeys=o,O,*<Return>,<:>,!^F
 
+let b:undo_indent = "setl ai< inde< indk<"
+
 " Only define the function once.
 if exists("*GetSassIndent")
   finish