diff --git a/lib/types/siwe-types.js b/lib/types/siwe-types.js
--- a/lib/types/siwe-types.js
+++ b/lib/types/siwe-types.js
@@ -15,7 +15,7 @@
 export type SIWEAuthRequest = {
   +message: string,
   +signature: string,
-  +calendarQuery?: ?CalendarQuery,
+  +calendarQuery: CalendarQuery,
   +deviceTokenUpdateRequest?: ?DeviceTokenUpdateRequest,
   +platformDetails: PlatformDetails,
   +watchedIDs: $ReadOnlyArray<string>,