2 files changed, 4 insertions, 1 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 87cfafad3c6..f321ae359bd 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,5 +1,8 @@
 2011-09-11  Lars Magne Ingebrigtsen  <larsi@gnus.org>
 
+        * image-mode.el (image-next-line): The line parameter is mandatory
+        (bug#9258).
+
         * dired.el (dired-sort-toggle-or-edit): Mention -o and -g, too,
         which can be useful (bug#9301).
 
diff --git a/lisp/image-mode.el b/lisp/image-mode.el
index f75f4e20219..cffa2592aa1 100644
--- a/lisp/image-mode.el
+++ b/lisp/image-mode.el
@@ -163,7 +163,7 @@ Stop if the left edge of the image is reached."
   (interactive "p")
   (image-forward-hscroll (- n)))
 
-(defun image-next-line (&optional n)
+(defun image-next-line (n)
   "Scroll image in current window upward by N lines.
 Stop if the bottom edge of the image is reached."
   (interactive "p")