(backup-buffer): Use file-ownership-preserved-p.

1 files changed, 1 insertions, 1 deletions

diff --git a/lisp/files.el b/lisp/files.el
index 6037b19435d..e226461bd83 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -1371,7 +1371,7 @@ the modes of the new file to agree with the old modes."
                           (and backup-by-copying-when-mismatch
                                (let ((attr (file-attributes real-file-name)))
                                  (or (nth 9 attr)
-                                     (/= (nth 2 attr) (user-uid))))))
+                                     (not (file-ownership-preserved-p real-file-name))))))
                       (condition-case ()
                           (copy-file real-file-name backupname t t)
                         (file-error