1 files changed, 1 insertions, 1 deletions

diff --git a/lisp/mail/mail-utils.el b/lisp/mail/mail-utils.el
index 328a5d50d34..2e6f06a6758 100644
--- a/lisp/mail/mail-utils.el
+++ b/lisp/mail/mail-utils.el
@@ -236,7 +236,7 @@ comma-separated list, and return the pruned list."
       (setq mail-dont-reply-to-names
             (concat
              ;; `rmail-default-dont-reply-to-names' is obsolete.
-             (if rmail-default-dont-reply-to-names
+             (if (bound-and-true-p rmail-default-dont-reply-to-names)
                  (concat rmail-default-dont-reply-to-names "\\|")
                "")
              (if (and user-mail-address