diff --git a/src/main/java/com/example/Actor.java b/src/main/java/com/example/Actor.java
index 90abbed..0cac934 100644
--- a/src/main/java/com/example/Actor.java
+++ b/src/main/java/com/example/Actor.java
@@ -27,12 +27,12 @@ public class Actor extends AbstractBehavior<Actor.Message> {
     @Override
     public Receive<Actor.Message> createReceive(){
         return newReceiveBuilder()
-                //.onMessage(StartMessage.class, this::onStartMessage)
+                .onMessage(StartMessage.class, this::onStartMessage)
                 .build();
     }
 
-    private Behavior<Message> onStartMessage(Expression expression){
-        this.expression = expression;
+    private Behavior<Message> onStartMessage(StartMessage message){
+        this.expression = message.expression;
 
         return this;
     }