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-rw-r--r--lisp/textmodes/dns-mode.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/textmodes/dns-mode.el b/lisp/textmodes/dns-mode.el
index beab676e30..d5e259e5f9 100644
--- a/lisp/textmodes/dns-mode.el
+++ b/lisp/textmodes/dns-mode.el
@@ -222,7 +222,7 @@ This function is run from `before-save-hook'."
;; We return nil in case this is used in write-contents-functions.
nil)))
-;;;###autoload(add-to-list 'auto-mode-alist '("\\.soa\\'" . dns-mode))
+;;;###autoload(add-to-list 'auto-mode-alist (purecopy '("\\.soa\\'" . dns-mode)))
(provide 'dns-mode)