diff --git a/swh/web/common/service.py b/swh/web/common/service.py
--- a/swh/web/common/service.py
+++ b/swh/web/common/service.py
@@ -850,9 +850,6 @@
     """
     visit = storage.origin_visit_get_latest(
         origin_url, require_snapshot=require_snapshot)
-    if isinstance(visit['origin'], int):
-        # soon-to-be-legacy origin ids
-        visit['origin'] = storage.origin_get({'id': visit['origin']})['url']
     return converters.from_origin_visit(visit)
 
 
diff --git a/swh/web/tests/api/views/test_origin.py b/swh/web/tests/api/views/test_origin.py
--- a/swh/web/tests/api/views/test_origin.py
+++ b/swh/web/tests/api/views/test_origin.py
@@ -234,6 +234,17 @@
             self, new_origin, visit_dates, new_snapshots):
 
         self.storage.origin_add_one(new_origin)
+
+        url = reverse('api-1-origin-visit-latest',
+                      url_args={'origin_url': new_origin['url']})
+
+        rv = self.client.get(url)
+        self.assertEqual(rv.status_code, 404, rv.data)
+        self.assertEqual(rv.data, {
+            'exception': 'NotFoundExc',
+            'reason': 'No visit for origin %s found' % new_origin['url']
+        })
+
         visit_dates.sort()
         visit_ids = []
         for i, visit_date in enumerate(visit_dates):