1 files changed, 1 insertions, 1 deletions

diff --git a/lisp/diff-mode.el b/lisp/diff-mode.el
index 0090a61d0ab..4913ef72e35 100644
--- a/lisp/diff-mode.el
+++ b/lisp/diff-mode.el
@@ -1717,7 +1717,7 @@ For use in `add-log-current-defun-function'."
             (let ((old (if switched dst src)))
               (with-temp-buffer
                 (insert (car old))
-                (funcall (with-current-buffer buf major-mode))
+                (funcall (buffer-local-value 'major-mode buf))
                 (goto-char (+ (point-min) (cdr old)))
                 (add-log-current-defun))))
           (with-current-buffer buf