diff --git a/CTFd/themes/admin/templates/challenges/preview.html b/CTFd/themes/admin/templates/challenges/preview.html
index a3b56954..ead85d17 100644
--- a/CTFd/themes/admin/templates/challenges/preview.html
+++ b/CTFd/themes/admin/templates/challenges/preview.html
@@ -7,6 +7,7 @@
     {% if "beta" in Configs.ctf_theme %}
         {{ Assets.js("assets/js/challenges.js") }}
         <script type="module">
+            CTFd.config.preview = true;
             CTFd.pages.challenge.displayChallenge(CHALLENGE_ID);
         </script>
     {% else %}