diff --git a/src/plone/restapi/tests/test_serializer_summary.py b/src/plone/restapi/tests/test_serializer_summary.py
index 794579241..9a7b7db45 100644
--- a/src/plone/restapi/tests/test_serializer_summary.py
+++ b/src/plone/restapi/tests/test_serializer_summary.py
@@ -273,7 +273,10 @@ def test_dx_event_with_recurrence_new_version(self):
         tomorrow_str = tomorrow.strftime("%Y-%m-%d")
         ot = OccurrenceTraverser(self.event, self.request)
         ocurrence = ot.publishTraverse(self.request, tomorrow_str)
+        self.request.form["metadata_fields"] = ["start"]
         summary = getMultiAdapter((ocurrence, self.request), ISerializeToJsonSummary)()
-
-        self.assertEqual(summary["start"], tomorrow_str)
-        self.assertEqual(summary["Title"], ocurrence.Title())
+        self.assertEqual(
+            datetime.fromisoformat(summary["start"]).date().isoformat(),
+            tomorrow.date().isoformat(),
+        )
+        self.assertEqual(summary["title"], ocurrence.Title())