diff --git a/src/pretix/presale/templates/pretixpresale/event/index.html b/src/pretix/presale/templates/pretixpresale/event/index.html
index f70363250..72161d924 100644
--- a/src/pretix/presale/templates/pretixpresale/event/index.html
+++ b/src/pretix/presale/templates/pretixpresale/event/index.html
@@ -216,7 +216,7 @@
             <form method="post" data-asynctask
                     data-asynctask-headline="{% trans "We're now trying to reserve this for you!" %}"
                     data-asynctask-text="{% blocktrans with time=event.settings.reservation_time %}Once the items are in your cart, you will have {{ time }} minutes to complete your purchase.{% endblocktrans %}"
-                    class="{% if event.seating_plan_id %}has-seating"{% endif %}
+                    class="{% if event.seating_plan_id %}has-seating{% endif %}"
                     action="{% eventurl request.event "presale:event.cart.add" cart_namespace=cart_namespace %}?next={{ cart_redirect|urlencode }}">
                 {% csrf_token %}
                 <input type="hidden" name="subevent" value="{{ subevent.id|default_if_none:"" }}" />