diff --git a/runtime/indent/meson.vim b/runtime/indent/meson.vim
index 549209c..09131f5 100644
--- a/runtime/indent/meson.vim
+++ b/runtime/indent/meson.vim
@@ -20,6 +20,8 @@
 setlocal indentexpr=GetMesonIndent(v:lnum)
 setlocal indentkeys+==elif,=else,=endforeach,=endif,0)
 
+let b:undo_indent = "setl ai< inde< indk< lisp<"
+
 " Only define the function once.
 if exists("*GetMesonIndent")
   finish