diff --git a/lisp/org-clock.el b/lisp/org-clock.el
index 67feb6b35..806bc02de 100644
--- a/lisp/org-clock.el
+++ b/lisp/org-clock.el
@@ -3233,7 +3233,7 @@ The details of what will be saved are regulated by the variable
 		 org-clock-has-been-used
 		 (not (file-exists-p org-clock-persist-file))))
     (with-temp-file org-clock-persist-file
-      (insert (format ";; %s - %s at %s\n"
+      (insert (format ";; %s - %s at %s -*- lexical-binding: t; -*-\n"
 		      (file-name-nondirectory org-clock-persist-file)
 		      (system-name)
 		      (format-time-string (org-time-stamp-format t))))