diff --git a/broker/client.js b/broker/client.js
index 11fb35b1b690e4a0dd18f775d4bef46ae994e887..c291e929ed0d4f1f13846ced38009fa68d535833 100644
--- a/broker/client.js
+++ b/broker/client.js
@@ -165,6 +165,8 @@ class AMQPClient {
 
     if (uuid != null) {
       opts.headers.uuid = uuid;
+    } else {
+      opts.headers.category = 'simulator';
     }
 
     this._channel.publish(VILLAS_EXCHANGE, '', new Buffer(JSON.stringify(data)), opts);