diff --git a/src/actors/runtime/AbstractActor.ts b/src/actors/runtime/AbstractActor.ts
old mode 100644
new mode 100755
index 60bb84b2..1be2dcea
--- a/src/actors/runtime/AbstractActor.ts
+++ b/src/actors/runtime/AbstractActor.ts
@@ -115,8 +115,8 @@ export default abstract class AbstractActor {
     timerName: string,
     callback: string,
     dueTime: Temporal.Duration,
-    period: Temporal.Duration,
-    ttl?: Temporal.Duration,
+    period: Temporal.Duration | undefined,
+    ttl?: Temporal.Duration | undefined,
     state?: any,
   ) {
     // Register the timer in the sidecar
diff --git a/src/types/ActorReminder.type.ts b/src/types/ActorReminder.type.ts
old mode 100644
new mode 100755