diff --git a/pretix_mercadopago/payment.py b/pretix_mercadopago/payment.py
index b1933b5..f93ebf7 100644
--- a/pretix_mercadopago/payment.py
+++ b/pretix_mercadopago/payment.py
@@ -152,7 +152,7 @@ def settings_content_render(self, request):
             settings_content = "<div class='alert alert-info'>%s<br /><code>%s</code></div>" % (
                 _('Please configure a MercadoPago Webhook to the following endpoint in order '
                   'to automatically cancel orders when payments are refunded externally.'),
-                build_global_uri('plugins:pretix_mercadopago:webhook')
+                build_absolute_uri(request.event, 'plugins:pretix_mercadopago:webhook')
             )
 
         if self.event.currency is not self.settings.get('currency'):