diff --git a/lisp/2048.el b/lisp/2048.el
index 7fcdfe2..2482ed1 100644
--- a/lisp/2048.el
+++ b/lisp/2048.el
@@ -371,7 +371,8 @@ individually."
   (setq font-lock-defaults '(2048-highlights)))
 
 (defun play-2048 ()
-    "Play 2048 in Emacs!"
+  "Play 2048 in Emacs!"
+  (interactive)
   (switch-to-buffer (get-buffer-create "*2048*"))
   (2048-mode))