diff --git a/themes/quark-open-publishing/templates/calendar.html.twig b/themes/quark-open-publishing/templates/calendar.html.twig
index 5c38b9bd..4faa9bb2 100644
--- a/themes/quark-open-publishing/templates/calendar.html.twig
+++ b/themes/quark-open-publishing/templates/calendar.html.twig
@@ -1,6 +1,7 @@
 {% extends 'partials/base.html.twig' %}
 {% set show_breadcrumbs = header_var('show_breadcrumbs', [page, blog])|defined(true) %}
 {% set show_sidebar = header_var('show_sidebar', [page, blog])|defined(true)  %}
+{% set blog_image = page.media.images[page.header.hero_image] ?: page.media.images|first %}
 
 {% if not (grav.uri.param('chromeless') or grav.uri.param('embedded') or grav.uri.param('standalone')) and not(theme_var('chromeless.enabled')) %}
     {% block hero %}