diff --git a/scripts/upcoming.js b/scripts/upcoming.js
index 5ff49aaf..4fab9f0d 100644
--- a/scripts/upcoming.js
+++ b/scripts/upcoming.js
@@ -141,7 +141,7 @@ const year = /^[0-9]{4}$/;
         // Build launch time objects to update
         calculatedTimes = {
           flight_number: (base_flight_number + manifest_index),
-          launch_year: zone.year(),
+          launch_year: (zone.year()).toString(),
           launch_date_unix: zone.unix(),
           launch_date_utc: zone.toISOString(),
           launch_date_local: localTime,