1 files changed, 2 insertions, 1 deletions

diff --git a/lisp/vc/diff-mode.el b/lisp/vc/diff-mode.el
index 948a45e6f5c..37ed4a53b44 100644
--- a/lisp/vc/diff-mode.el
+++ b/lisp/vc/diff-mode.el
@@ -2128,7 +2128,8 @@ fixed, visit it in a buffer."
         (goto-char hunk-end))
       (if modified-buffers
           (message "Deleted trailing whitespace from %s."
-                   (mapconcat (lambda (buf) (concat "`" (buffer-name buf) "'"))
+                   (mapconcat (lambda (buf) (format-message
+                                             "`%s'" (buffer-name buf)))
                               modified-buffers ", "))
         (message "No trailing whitespace to delete.")))))