1 files changed, 1 insertions, 1 deletions

diff --git a/lisp/calendar/diary-lib.el b/lisp/calendar/diary-lib.el
index 08eb40b5672..a8c24e05b74 100644
--- a/lisp/calendar/diary-lib.el
+++ b/lisp/calendar/diary-lib.el
@@ -594,7 +594,7 @@ is created."
 (defcustom diary-mail-days 7
   "*Number of days for `diary-mail-entries' to check."
   :group 'diary
-  :type integer)
+  :type 'integer)
 
 (defun diary-mail-entries (&optional ndays)
   "Send a mail message showing diary entries for next NDAYS days.