diff --git a/lisp/help-mode.el b/lisp/help-mode.el
index e1fc9fd..ac74e03 100644
--- a/lisp/help-mode.el
+++ b/lisp/help-mode.el
@@ -107,7 +107,7 @@ The format is (FUNCTION ARGS...).")
 
 (defun help-button-action (button)
   "Call BUTTON's help function."
-  (help-do-xref (button-start button)
+  (help-do-xref nil
 		(button-get button 'help-function)
 		(button-get button 'help-args)))