diff --git a/src/pretix/control/views/orders.py b/src/pretix/control/views/orders.py
index 08db73ebe..1b61332a6 100644
--- a/src/pretix/control/views/orders.py
+++ b/src/pretix/control/views/orders.py
@@ -1118,7 +1118,8 @@ class InvoiceDownload(EventPermissionRequiredMixin, View):
             invoice_pdf_task.apply(args=(self.invoice.pk,))
             return self.get(request, *args, **kwargs)
 
-        resp['Content-Disposition'] = 'attachment; filename="{}.pdf"'.format(self.invoice.number)
+        resp['Content-Disposition'] = 'inline; filename="{}.pdf"'.format(self.invoice.number)
+        resp._csp_ignore = True  # Some browser's PDF readers do not work with CSP
         return resp
 
 
diff --git a/src/pretix/presale/views/order.py b/src/pretix/presale/views/order.py
index 90262701a..9aa1b693b 100644
--- a/src/pretix/presale/views/order.py
+++ b/src/pretix/presale/views/order.py
@@ -914,5 +914,6 @@ class InvoiceDownload(EventViewMixin, OrderDetailMixin, View):
         except FileNotFoundError:
             invoice_pdf_task.apply(args=(invoice.pk,))
             return self.get(request, *args, **kwargs)
-        resp['Content-Disposition'] = 'attachment; filename="{}.pdf"'.format(invoice.number)
+        resp['Content-Disposition'] = 'inline; filename="{}.pdf"'.format(invoice.number)
+        resp._csp_ignore = True  # Some browser's PDF readers do not work with CSP
         return resp