diff --git a/server/src/models/Robot.ts b/server/src/models/Robot.ts
index 848a33a2..3b2717d6 100644
--- a/server/src/models/Robot.ts
+++ b/server/src/models/Robot.ts
@@ -37,6 +37,7 @@ interface ScheduleConfig {
   timezone: string;
   lastRunAt?: Date;
   nextRunAt?: Date;
+  dayOfMonth?: string;
   cronExpression?: string;
 }