diff --git a/libs/wingsdk/src/shared-aws/schedule.ts b/libs/wingsdk/src/shared-aws/schedule.ts
index 2011cb0ba9d..765fbe0b05a 100644
--- a/libs/wingsdk/src/shared-aws/schedule.ts
+++ b/libs/wingsdk/src/shared-aws/schedule.ts
@@ -18,7 +18,7 @@ export const convertUnixCronToAWSCron = (cron: string) => {
   }
 
   if (cron && dayOfMonth !== "*" && dayOfWeek !== "*") {
-    throw new Error("Cannot supply both 'day' and 'weekDay', use at most one");
+    throw new Error("Cannot restrict both 'day-of-month' and 'day-of-week' in a cron expression, at least one must be '*'");
   }
 
   if (dayOfWeek !== "*" && dayOfWeek !== "?") {