diff --git a/src/pretix/helpers/urls.py b/src/pretix/helpers/urls.py
index 79262df39..f551e907b 100644
--- a/src/pretix/helpers/urls.py
+++ b/src/pretix/helpers/urls.py
@@ -6,4 +6,4 @@ from django.core.urlresolvers import reverse
 def build_absolute_uri(urlname, args=None, kwargs=None):
     # Pass prefix='' as a possible SCRIPT_PREFIX (if pretix runs in a subdirectory)
     # is included in SITE_URL _and_ is added by reverse.
-    return urljoin(settings.SITE_URL, reverse(urlname, args, kwargs, prefix=''))
+    return urljoin(settings.SITE_URL, reverse(urlname, args=args, kwargs=kwargs, prefix=''))