diff --git a/src/pretix/presale/templates/pretixpresale/event/index.html b/src/pretix/presale/templates/pretixpresale/event/index.html
index 87b93b8580..2f658909c5 100644
--- a/src/pretix/presale/templates/pretixpresale/event/index.html
+++ b/src/pretix/presale/templates/pretixpresale/event/index.html
@@ -182,7 +182,7 @@
                     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 %}"
-                    action="{% eventurl request.event "presale:event.cart.add" cart_namespace=cart_namespace %}?next={{ cart_redirect|urlencode }}&next_error={{ request.path|urlencode }}{{ take_cart_id_param }}">
+                    action="{% eventurl request.event "presale:event.cart.add" cart_namespace=cart_namespace %}?next={{ cart_redirect|urlencode }}&next_error={{ request.path|urlencode }}">
                 {% csrf_token %}
                 <input type="hidden" name="subevent" value="{{ subevent.id|default_if_none:"" }}" />
                 {% if ev.seating_plan_id and event.settings.seating_choice %}
diff --git a/src/pretix/presale/views/event.py b/src/pretix/presale/views/event.py
index 904e033fa4..dc1f2412c0 100644
--- a/src/pretix/presale/views/event.py
+++ b/src/pretix/presale/views/event.py
@@ -515,7 +515,12 @@ class EventIndex(EventViewMixin, EventListMixin, CartMixin, TemplateView):
             }))
         elif request.GET.get('iframe', '') == '1' and len(self.request.GET.get('widget_data', '{}')) > 3:
             # We've been passed data from a widget, we need to create a cart session to store it.
-            get_or_create_cart_id(request, cache_widget_data=True)
+            return redirect_to_url(eventreverse(request.event, 'presale:event.index', kwargs=kwargs) + '?' + urlencode({
+                'require_cookie': 'true',
+                'cart_id': get_or_create_cart_id(request, cache_widget_data=True),
+                **({"locale": request.GET.get('locale')} if request.GET.get('locale') else {}),
+                **utm_params,
+            }))
         elif 'require_cookie' in request.GET and settings.SESSION_COOKIE_NAME not in request.COOKIES and \
                 '__Host-' + settings.SESSION_COOKIE_NAME not in self.request.COOKIES:
             # Cookies are in fact not supported
@@ -644,10 +649,6 @@ class EventIndex(EventViewMixin, EventListMixin, CartMixin, TemplateView):
         else:
             context['cart_redirect'] = self.request.path
 
-        if 'cart_namespace' in self.kwargs and self.request.GET.get('iframe') == '1' and 'take_cart_id' in self.request.GET:
-            from pretix.presale.views.cart import get_or_create_cart_id
-            context['take_cart_id_param'] = '&take_cart_id=' + get_or_create_cart_id(self.request)
-
         return context
 
     def _subevent_list_cachekey(self):