diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 12e27d97c88..15bf417b4ba 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,5 +1,9 @@
 2008-11-30  Glenn Morris  <rgm@gnu.org>
 
+	* vc-git.el (vc-git-diff):
+	* vc-hg.el (vc-hg-diff):
+	* vc-mtn.el (vc-mtn-diff): No need to duplicate vc-switches logic.
+
 	* eshell/esh-proc.el (eshell-needs-pipe): New variable.
 	(eshell-needs-pipe-p): New function.
 	(eshell-gather-process-output): Set process-connection-type according to
diff --git a/lisp/vc-mtn.el b/lisp/vc-mtn.el
index f5fffb7fc87..e4d7535ff6a 100644
--- a/lisp/vc-mtn.el
+++ b/lisp/vc-mtn.el
@@ -205,7 +205,7 @@ If you want to force an empty list of arguments, use t."
   "Get a difference report using monotone between two revisions of FILES."
   (apply 'vc-mtn-command (or buffer "*vc-diff*") 1 files "diff"
          (append
-           (vc-switches (if vc-mtn-diff-switches 'mtn) 'diff)
+           (vc-switches 'mtn 'diff)
            (if rev1 (list "-r" rev1)) (if rev2 (list "-r" rev2)))))
 
 (defun vc-mtn-annotate-command (file buf &optional rev)