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-rw-r--r--lisp/mail/rmail.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/mail/rmail.el b/lisp/mail/rmail.el
index 2952db2a6bf..379e345bef1 100644
--- a/lisp/mail/rmail.el
+++ b/lisp/mail/rmail.el
@@ -2287,7 +2287,7 @@ significant attribute change was made."
(insert value)))
;; Otherwise add a header line to record the attributes and set
;; all but this one to no.
- (let ((header-value "--------"))
+ (let ((header-value (copy-sequence "--------")))
(aset header-value attr value)
(goto-char (if limit (1- limit) (point-max)))
(setq altered (/= value ?-))