1 files changed, 2 insertions, 8 deletions

diff --git a/lisp/tar-mode.el b/lisp/tar-mode.el
index 7e5794410be..ad8bdea817b 100644
--- a/lisp/tar-mode.el
+++ b/lisp/tar-mode.el
@@ -748,14 +748,8 @@ appear on disk when you save the tar-file's buffer."
                 ;; which determine the coding-system and decode the text.
                 (let ((coding
                        (and set-auto-coding-function
-                            (funcall
-                             set-auto-coding-function
-                             (if (< (point-max) 4096)
-                                 (buffer-substring-no-properties 1 (point-max))
-                               (concat
-                                (buffer-substring-no-properties 1  1025)
-                                (buffer-substring-no-properties
-                                 (- (point-max) 3072) (point-max)))))))
+                            (save-excursion
+                              (funcall set-auto-coding-function (point-max)))))
                       (multibyte enable-multibyte-characters)
                       (detected (detect-coding-region
                                  1 (min 16384 (point-max)) t)))