diff --git a/npm-packages/convex/src/server/cron.ts b/npm-packages/convex/src/server/cron.ts
index 53e8e709b..f85c2e8d1 100644
--- a/npm-packages/convex/src/server/cron.ts
+++ b/npm-packages/convex/src/server/cron.ts
@@ -31,7 +31,7 @@ const DAYS_OF_WEEK = [
   "thursday",
   "friday",
   "saturday",
-];
+] as const;
 type DayOfWeek = (typeof DAYS_OF_WEEK)[number];
 /** @public */
 export type WeeklySchedule = {