diff --git a/src/pretix/helpers/urls.py b/src/pretix/helpers/urls.py
new file mode 100644
index 0000000000..ec9087f452
--- /dev/null
+++ b/src/pretix/helpers/urls.py
@@ -0,0 +1,5 @@
+from django.conf import settings
+
+
+def build_absolute_uri(url):
+    return settings.SITE_URL + url
diff --git a/src/pretix/plugins/paypal/payment.py b/src/pretix/plugins/paypal/payment.py
index 33d4d4d1a1..0939f79dc5 100644
--- a/src/pretix/plugins/paypal/payment.py
+++ b/src/pretix/plugins/paypal/payment.py
@@ -12,6 +12,7 @@ import paypalrestsdk
 from pretix.base.models import Quota
 from pretix.base.services.orders import mark_order_paid
 from pretix.base.payment import BasePaymentProvider
+from pretix.helpers.urls import build_absolute_uri
 
 
 logger = logging.getLogger('pretix.plugins.paypal')
@@ -88,8 +89,8 @@ class Paypal(BasePaymentProvider):
                 "payment_method": "paypal",
             },
             "redirect_urls": {
-                "return_url": request.build_absolute_uri(reverse('plugins:paypal:return')),
-                "cancel_url": request.build_absolute_uri(reverse('plugins:paypal:abort')),
+                "return_url": build_absolute_uri(reverse('plugins:paypal:return')),
+                "cancel_url": build_absolute_uri(reverse('plugins:paypal:abort')),
             },
             "transactions": [
                 {
diff --git a/src/pretix/plugins/paypal/views.py b/src/pretix/plugins/paypal/views.py
index e281edc089..ab9695e3c7 100644
--- a/src/pretix/plugins/paypal/views.py
+++ b/src/pretix/plugins/paypal/views.py
@@ -7,6 +7,7 @@ import paypalrestsdk
 from pretix.base.models import Event, Order
 from django.utils.translation import ugettext_lazy as _
 from django.utils.translation import ugettext as __
+from pretix.helpers.urls import build_absolute_uri
 from pretix.plugins.paypal.payment import Paypal
 
 
@@ -70,10 +71,10 @@ def retry(request, order):
                 "payment_method": "paypal",
             },
             "redirect_urls": {
-                "return_url": request.build_absolute_uri(reverse('plugins:paypal:retry', kwargs={
+                "return_url": build_absolute_uri(reverse('plugins:paypal:retry', kwargs={
                     'order': order.code
                 })),
-                "cancel_url": request.build_absolute_uri(reverse('plugins:paypal:retry', kwargs={
+                "cancel_url": build_absolute_uri(reverse('plugins:paypal:retry', kwargs={
                     'order': order.code
                 })),
             },
diff --git a/src/pretix/plugins/stripe/payment.py b/src/pretix/plugins/stripe/payment.py
index 0ce2740436..f185fa9c85 100644
--- a/src/pretix/plugins/stripe/payment.py
+++ b/src/pretix/plugins/stripe/payment.py
@@ -9,6 +9,7 @@ from django.utils.translation import ugettext_lazy as _
 from django import forms
 from pretix.base.models import Quota
 from pretix.base.services.orders import mark_order_paid
+from pretix.helpers.urls import build_absolute_uri
 import stripe
 from pretix.base.payment import BasePaymentProvider
 
@@ -39,7 +40,7 @@ class Stripe(BasePaymentProvider):
         return "<div class='alert alert-info'>%s<br /><code>%s</code></div>" % (
             _('Please configure a <a href="https://dashboard.stripe.com/account/webhooks">Stripe Webhook</a> to '
               'the following endpoint in order to automatically cancel orders when a charges are refunded externally.'),
-            request.build_absolute_uri(reverse('plugins:stripe:webhook'))
+            build_absolute_uri(reverse('plugins:stripe:webhook'))
         )
 
     def checkout_is_valid_session(self, request):
diff --git a/src/pretix/presale/views/checkout.py b/src/pretix/presale/views/checkout.py
index 324e397f5f..f297c93a86 100644
--- a/src/pretix/presale/views/checkout.py
+++ b/src/pretix/presale/views/checkout.py
@@ -13,6 +13,7 @@ from django.utils.translation import ugettext_lazy as _
 from pretix.base.services.mail import mail
 from pretix.base.models import CartPosition, QuestionAnswer, Quota, Order, OrderPosition
 from pretix.base.signals import register_payment_providers
+from pretix.helpers.urls import build_absolute_uri
 from pretix.presale.forms.checkout import QuestionsForm
 from pretix.presale.views import EventViewMixin, CartDisplayMixin, EventLoginRequiredMixin
 
@@ -304,7 +305,7 @@ class OrderConfirm(EventViewMixin, CartDisplayMixin, EventLoginRequiredMixin, Ch
                     {
                         'user': request.user, 'order': order,
                         'event': request.event,
-                        'url': request.build_absolute_uri(self.get_order_url(order)),
+                        'url': build_absolute_uri(self.get_order_url(order)),
                         'payment': self.payment_provider.order_pending_mail_render(order)
                     },
                     request.event
diff --git a/src/pretix/presale/views/event.py b/src/pretix/presale/views/event.py
index 75bdb77cc8..d295c4179c 100644
--- a/src/pretix/presale/views/event.py
+++ b/src/pretix/presale/views/event.py
@@ -14,6 +14,7 @@ from django.utils.translation import ugettext_lazy as _
 from django.conf import settings
 from pretix.base.services.mail import mail
 from pretix.base.models import User
+from pretix.helpers.urls import build_absolute_uri
 from pretix.presale.forms.auth import GlobalRegistrationForm, LocalRegistrationForm, PasswordForgotForm, \
     PasswordRecoverForm
 from pretix.presale.forms.auth import LoginForm
@@ -187,10 +188,10 @@ class EventForgot(EventViewMixin, TemplateView):
                     {
                         'user': user,
                         'event': self.request.event,
-                        'url': settings.SITE_URL + reverse('presale:event.forgot.recover', kwargs={
+                        'url': build_absolute_uri(reverse('presale:event.forgot.recover', kwargs={
                             'event': self.request.event.slug,
                             'organizer': self.request.event.organizer.slug,
-                        }) + '?token=' + self.generate_token(user),
+                        }) + '?token=' + self.generate_token(user)),
                     },
                     self.request.event
                 )