diff --git a/lisp/lib/ui.el b/lisp/lib/ui.el
index 7a7c5fc2e..62183a086 100644
--- a/lisp/lib/ui.el
+++ b/lisp/lib/ui.el
@@ -19,7 +19,7 @@ If FORCE-P is omitted when `window-size-fixed' is non-nil, resizing will fail."
 Returns t if it is safe to kill this session. Does not prompt if no real buffers
 are open."
   (or (not (ignore-errors (doom-real-buffer-list)))
-      (if (use-dialog-box-p)
+      (if use-dialog-box
           (pcase (x-popup-dialog
                   t `("Really quit Emacs?"
                       ("Quit anyway" . t)