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-rw-r--r--lisp/files.el1
1 files changed, 1 insertions, 0 deletions
diff --git a/lisp/files.el b/lisp/files.el
index 0c5640d13a4..ca698cab33d 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -124,6 +124,7 @@ the default for a new file created there by you.
This variable is relevant only if `backup-by-copying' is nil."
:type 'boolean
:group 'backup)
+(put 'backup-by-copying-when-mismatch 'permanent-local t)
(defcustom backup-by-copying-when-privileged-mismatch 200
"Non-nil means create backups by copying to preserve a privileged owner.