diff --git a/calendar/experiments/calendar/schema/calendar-items.json b/calendar/experiments/calendar/schema/calendar-items.json
index d8ae00a..bc44788 100644
--- a/calendar/experiments/calendar/schema/calendar-items.json
+++ b/calendar/experiments/calendar/schema/calendar-items.json
@@ -11,7 +11,7 @@
           "calendarId": { "type": "string" },
           "type": { "type": "string", "enum": ["event", "task"] },
           "instance": { "type": "string", "optional": true },
-          "format": { "$ref": "CalendarItemFormat", "optional": true },
+          "format": { "$ref": "CalendarItemFormats", "optional": true },
           "item": { "$ref": "RawCalendarItem" },
           "metadata": { "type": "object", "additionalProperties": { "type": "any" }, "optional": true }
         }
@@ -120,7 +120,7 @@
             "name": "updateProperties",
             "type": "object",
             "properties": {
-              "format": { "$ref": "CalendarItemFormat", "optional": true },
+              "format": { "$ref": "CalendarItemFormats", "optional": true },
               "item": { "$ref": "RawCalendarItem" },
               "returnFormat": { "$ref": "ReturnFormat", "optional": true },
               "metadata": { "type": "object", "additionalProperties": { "type": "any" }, "optional": true }