diff --git a/themes/red/layouts/shortcodes/guestbook.html b/themes/red/layouts/shortcodes/guestbook.html
index 26d6fa9..e2a7148 100644
--- a/themes/red/layouts/shortcodes/guestbook.html
+++ b/themes/red/layouts/shortcodes/guestbook.html
@@ -1,4 +1,5 @@
-<script 
+{{ if hugo.IsProduction }}
+<script
     data-isso="//comments.redstrate.com/"
     data-isso-title=""
     data-isso-avatar="false"
@@ -8,3 +9,6 @@
 <section id="isso-thread" data-title="Guestbook" data-isso-id="/guestbook">
     <noscript>Javascript needs to be activated to view comments.</noscript>
 </section>
+{{ else }}
+Guestbook is disabled in development mode.
+{{ end }}