diff --git a/server/routes/calendar.js b/server/routes/calendar.js
index 395323f42..9c5cd6268 100644
--- a/server/routes/calendar.js
+++ b/server/routes/calendar.js
@@ -24,7 +24,7 @@ const renderEvents = (yearEvents, res, onlyFirstDays = false, calNameExtra = '')
             if (!event) {
                 continue;
             }
-            const ics = event.toIcs(year, translations, fallbackTranslations, clearLinkedText, i, onlyFirstDays, calNameExtra);
+            const ics = event.toIcs(parseInt(year), translations, fallbackTranslations, clearLinkedText, i, onlyFirstDays, calNameExtra);
             if (ics !== null) {
                 events.push(ics);
             }