diff --git a/src/cron/tool/CronSchemas.ts b/src/cron/tool/CronSchemas.ts
index 752f9f822..2e78c807f 100644
--- a/src/cron/tool/CronSchemas.ts
+++ b/src/cron/tool/CronSchemas.ts
@@ -26,7 +26,7 @@ export const CRON_SCHEDULE_SCHEMA = {
       properties: {
         type: { const: "delay" },
         amount: { type: "number", exclusiveMinimum: 0 },
-        unit: { enum: ["second", "minute", "hour", "day"] },
+        unit: { type: "string", enum: ["second", "minute", "hour", "day"] },
       },
     },
   ],