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-rw-r--r--lisp/mail/mail-hist.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/mail/mail-hist.el b/lisp/mail/mail-hist.el
index e02d4218dd2..a13f9de1740 100644
--- a/lisp/mail/mail-hist.el
+++ b/lisp/mail/mail-hist.el
@@ -80,7 +80,7 @@ previous/next input.")
(defcustom mail-hist-history-size (or kill-ring-max 1729)
"The maximum number of elements in a mail field's history.
Oldest elements are dumped first."
- :type 'integer)
+ :type 'natnum)
;;;###autoload
(defcustom mail-hist-keep-history t