diff --git a/yasnippet.el b/yasnippet.el
index 6f749a5..46624ed 100644
--- a/yasnippet.el
+++ b/yasnippet.el
@@ -618,9 +618,6 @@ override bindings from other packages (e.g., `company-mode')."
 
 ;;; Minor mode stuff
 
-;; XXX: `last-buffer-undo-list' is somehow needed in Carbon Emacs for MacOSX
-(defvar last-buffer-undo-list nil)
-
 (defvar yas--minor-mode-menu nil
   "Holds the YASnippet menu.")