diff --git a/src/pretix/helpers/urls.py b/src/pretix/helpers/urls.py
index f551e907b..21624ff77 100644
--- a/src/pretix/helpers/urls.py
+++ b/src/pretix/helpers/urls.py
@@ -4,6 +4,4 @@ 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=args, kwargs=kwargs, prefix=''))
+    return urljoin(settings.SITE_URL, reverse(urlname, args=args, kwargs=kwargs))
diff --git a/src/tests/helpers/__init__.py b/src/tests/helpers/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/src/tests/helpers/test_urls.py b/src/tests/helpers/test_urls.py
new file mode 100644
index 000000000..c9b054aa6
--- /dev/null
+++ b/src/tests/helpers/test_urls.py
@@ -0,0 +1,14 @@
+from django.conf import settings
+from pretix.helpers.urls import build_absolute_uri
+from django.core import urlresolvers
+
+
+def test_site_url_domain():
+    settings.SITE_URL = 'https://example.com'
+    assert build_absolute_uri('control:auth.login') == 'https://example.com/control/login'
+
+
+def test_site_url_subpath():
+    settings.SITE_URL = 'https://example.com/presale'
+    urlresolvers.set_script_prefix('/presale/')
+    assert build_absolute_uri('control:auth.login') == 'https://example.com/presale/control/login'