diff --git a/src/services/missionInventoryUpdateService.ts b/src/services/missionInventoryUpdateService.ts
index 21880195..09f64a9c 100644
--- a/src/services/missionInventoryUpdateService.ts
+++ b/src/services/missionInventoryUpdateService.ts
@@ -630,10 +630,9 @@ export const addMissionInventoryUpdates = async (
             case "CalendarProgress": {
                 const calendarProgress = getCalendarProgress(inventory);
                 const currentSeason = getWorldState().KnownCalendarSeasons[0];
-                const index = currentSeason.Days.findIndex(
+                calendarProgress.SeasonProgress.LastCompletedChallengeDayIdx = currentSeason.Days.findIndex(
                     x => x.events[0].challenge == value[value.length - 1].challenge
                 );
-                calendarProgress.SeasonProgress.LastCompletedChallengeDayIdx = index;
                 checkCalendarChallengeCompletion(calendarProgress, currentSeason);
                 /*for (const progress of value) {
                     const challengeName = progress.challenge.substring(progress.challenge.lastIndexOf("/") + 1);