diff --git a/test/manual/indent/elisp.el b/test/manual/indent/elisp.el
index f3874b5c3e0..7d634ae84c9 100644
--- a/test/manual/indent/elisp.el
+++ b/test/manual/indent/elisp.el
@@ -1,3 +1,4 @@
+;; -*- lexical-binding:t -*-
 (defun x ()
   (print (quote ( thingy great
 		  stuff)))