diff --git a/contracts/cron_job.go b/contracts/cron_job.go
index bc62cb5..e16bc9f 100644
--- a/contracts/cron_job.go
+++ b/contracts/cron_job.go
@@ -11,6 +11,8 @@ type CronJob interface {
 type JobArgs interface {
 	river.JobArgs
 	river.JobArgsWithInsertOpts
+
+	UniqueID() string
 }
 
 type CronJobArg struct {