1 files changed, 1 insertions, 1 deletions

diff --git a/lisp/custom.el b/lisp/custom.el
index 869681227ba..5e5c5a644b1 100644
--- a/lisp/custom.el
+++ b/lisp/custom.el
@@ -353,7 +353,7 @@ Fourth argument TYPE is the custom option type."
         ((eq keyword :tag)
          (put symbol 'custom-tag value))
         (t
-         (error "Unknown keyword %s" symbol))))  
+         (error "Unknown keyword %s" keyword))))
 
 (defun custom-add-option (symbol option)
   "To the variable SYMBOL add OPTION.