1 files changed, 3 insertions, 1 deletions

diff --git a/lisp/progmodes/which-func.el b/lisp/progmodes/which-func.el
index 59933a944d5..721c610517a 100644
--- a/lisp/progmodes/which-func.el
+++ b/lisp/progmodes/which-func.el
@@ -229,7 +229,9 @@ It creates the Imenu index for the buffer, if necessary."
          (error "Error in which-func-update: %S" info))))))
 
 ;;;###autoload
-(defalias 'which-func-mode 'which-function-mode)
+(defun which-func-mode (&optional arg)
+  (which-function-mode arg))
+(make-obsolete 'which-func-mode 'which-function-mode "24.1")
 
 (defvar which-func-update-timer nil)