diff --git a/src/test/java/io/vertx/mqtt/test/client/MqttClientOutOfOrderAcksTest.java b/src/test/java/io/vertx/mqtt/test/client/MqttClientOutOfOrderAcksTest.java
index 8801e31d..4d741dbe 100644
--- a/src/test/java/io/vertx/mqtt/test/client/MqttClientOutOfOrderAcksTest.java
+++ b/src/test/java/io/vertx/mqtt/test/client/MqttClientOutOfOrderAcksTest.java
@@ -95,7 +95,7 @@ private void clientSendThreePublishMessages(MqttQoS mqttQoS, TestContext context
   public void before(TestContext context) {
     server = MqttServer.create(vertx);
     server.exceptionHandler(t -> context.fail());
-    server.endpointHandler(MqttClientOutOfOrderAcksTest::serverLogic).listen(context.asyncAssertSuccess());
+    server.endpointHandler(MqttClientOutOfOrderAcksTest::serverLogic).listen(1885, context.asyncAssertSuccess());
   }
 
   @After