diff --git a/types/cron/index.d.ts b/types/cron/index.d.ts
index d4fa027c93..780890c014 100644
--- a/types/cron/index.d.ts
+++ b/types/cron/index.d.ts
@@ -14,6 +14,7 @@ interface CronJobStatic {
 interface CronJob {
     start(): void;
     stop(): void;
+    running: boolean | undefined;
 }
 export declare var CronJob: CronJobStatic;