diff --git a/src/pretix/presale/ical.py b/src/pretix/presale/ical.py
index 5004613715..a6ab6ddad9 100644
--- a/src/pretix/presale/ical.py
+++ b/src/pretix/presale/ical.py
@@ -19,6 +19,12 @@ def get_ical(events):
     for ev in events:
         event = ev if isinstance(ev, Event) else ev.event
         tz = pytz.timezone(event.settings.timezone)
+        if isinstance(ev, Event):
+            url = build_absolute_uri(event, 'presale:event.index')
+        else:
+            url = build_absolute_uri(event, 'presale:event.index', {
+                'subevent': ev.pk
+            })
 
         vevent = cal.add('vevent')
         vevent.add('summary').value = str(ev.name)
@@ -29,7 +35,7 @@ def get_ical(events):
         vevent.add('uid').value = 'pretix-{}-{}-{}@{}'.format(
             event.organizer.slug, event.slug,
             ev.pk if not isinstance(ev, Event) else '0',
-            urlparse(settings.SITE_URL).netloc
+            urlparse(url).netloc
         )
 
         if event.settings.show_times:
@@ -44,13 +50,7 @@ def get_ical(events):
                 vevent.add('dtend').value = ev.date_to.astimezone(tz).date()
 
         descr = []
-
-        if isinstance(ev, Event):
-            descr.append(_('Tickets: {url}').format(url=build_absolute_uri(event, 'presale:event.index')))
-        else:
-            descr.append(_('Tickets: {url}').format(url=build_absolute_uri(event, 'presale:event.index', {
-                'subevent': ev.pk
-            })))
+        descr.append(_('Tickets: {url}').format(url=url))
 
         if ev.date_admission:
             descr.append(str(_('Admission: {datetime}')).format(
diff --git a/src/tests/presale/test_event.py b/src/tests/presale/test_event.py
index 96f8835577..6f6cd2fece 100644
--- a/src/tests/presale/test_event.py
+++ b/src/tests/presale/test_event.py
@@ -852,7 +852,7 @@ class EventIcalDownloadTest(EventTestMixin, SoupTest):
         self.assertIn('LOCATION:DUMMY ARENA', ical, 'incorrect location')
         self.assertIn('ORGANIZER:%s' % self.event.organizer.name, ical, 'incorrect organizer')
         self.assertTrue(re.search(r'DTSTAMP:\d{8}T\d{6}Z', ical), 'incorrect timestamp')
-        self.assertTrue(re.search(r'UID:\w*-\w*-0-\d{20}', ical), 'missing UID key')
+        self.assertTrue(re.search(r'UID:pretix-\w*-\w*-0@', ical), 'missing UID key')
 
     def test_utc_timezone(self):
         ical = self.client.get('/%s/%s/ical/' % (self.orga.slug, self.event.slug)).content.decode()