--- reftex-toc.el.old	2019-06-15 18:12:47.662071109 -0400
+++ reftex-toc.el	2019-06-15 18:16:25.422666122 -0400
@@ -872,7 +872,7 @@
     (setq newlabel (read-string (format "Rename label \"%s\" to:" label)))
     (if (assoc newlabel (symbol-value reftex-docstruct-symbol))
         (if (not (y-or-n-p
-                  (format-message "Label `%s' exists.  Use anyway? " label)))
+                  (format-message "Label `%s' exists.  Use anyway? " newlabel)))
             (error "Abort")))
     (save-excursion
       (save-window-excursion