diff --git a/app/features/calendar/core/ICal.server.ts b/app/features/calendar/core/ICal.server.ts
index dd59895ad..37f3869ef 100644
--- a/app/features/calendar/core/ICal.server.ts
+++ b/app/features/calendar/core/ICal.server.ts
@@ -34,6 +34,7 @@ function eventInfoAsICalEvent(event: CalendarEvent): ics.EventAttributes {
 	const eventLink = `${SENDOU_INK_BASE_URL}${event.url}`;
 
 	return {
+		uid: `event-${event.id}@sendou.ink`,
 		title: event.name,
 		start: [
 			startDate.getUTCFullYear(),