diff --git a/lisp/gnus/gnus-sum.el b/lisp/gnus/gnus-sum.el
index 9c95934ee02..99b970e323e 100644
--- a/lisp/gnus/gnus-sum.el
+++ b/lisp/gnus/gnus-sum.el
@@ -11963,7 +11963,7 @@ Argument REVERSE means reverse order."
   (interactive "P")
   (gnus-summary-sort 'chars reverse))
 
-(defun gnus-summary-sort-by-mark (&optional reverse)
+(defun gnus-summary-sort-by-marks (&optional reverse)
   "Sort the summary buffer by article marks.
 Argument REVERSE means reverse order."
   (interactive "P")