diff --git a/modoboa/calendars/tests.py b/modoboa/calendars/tests.py
index 3f00ed214..503c9e8e6 100644
--- a/modoboa/calendars/tests.py
+++ b/modoboa/calendars/tests.py
@@ -461,8 +461,8 @@ class EventViewSetTestCase(TestDataMixin, ModoAPITestCase):
         url = f"/api/v2/user-calendars/{self.calendar.pk}/events/1234/"
         data = {
             "title": "Test event",
-            "start": "2018-03-27T00:00:00Z",
-            "end": "2018-03-28T00:00:00Z",
+            "start_date": "2018-03-27",
+            "end_date": "2018-03-28",
             "allDay": True,
             "color": "#ffdddd",
             "description": "Description",