diff --git a/coap-core/src/test/java/com/mbed/coap/server/CoapServerBuilderTest.java b/coap-core/src/test/java/com/mbed/coap/server/CoapServerBuilderTest.java
index 52181f03..bdf6670d 100644
--- a/coap-core/src/test/java/com/mbed/coap/server/CoapServerBuilderTest.java
+++ b/coap-core/src/test/java/com/mbed/coap/server/CoapServerBuilderTest.java
@@ -16,11 +16,12 @@
  */
 package com.mbed.coap.server;
 
+import static com.mbed.coap.transport.InMemoryCoapTransport.create;
+import static com.mbed.coap.utils.Networks.localhost;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.mockito.Mockito.mock;
 import com.mbed.coap.client.CoapClient;
-import com.mbed.coap.transport.InMemoryCoapTransport;
 import java.time.Duration;
 import java.util.concurrent.ScheduledExecutorService;
 import org.junit.jupiter.api.Test;
@@ -62,20 +63,19 @@ public void shouldFail_whenIllegalTimeoutValue() throws Exception {
     @Test
     public void shouldReuseBuilder() throws Exception {
         CoapServer server = new CoapServerBuilder()
-                .transport(InMemoryCoapTransport.create(5683))
+                .transport(create(5683))
                 .build().start();
 
         // when, builder is created
-        CoapServerBuilder builder = CoapServer.builder()
-                .transport(InMemoryCoapTransport.create());
+        CoapServerBuilder builder = CoapServer.builder();
 
         // then, it can be reused multiple times
-        for (int i = 0; i < 3; i++) {
-            CoapClient client = builder.buildClient(server.getLocalSocketAddress());
-            assertNotNull(client.ping().get());
-            client.close();
-        }
+        CoapClient client1 = builder.transport(create()).buildClient(localhost(5683));
+        CoapClient client2 = builder.transport(create()).buildClient(localhost(5683));
+        assertNotNull(client1.ping().get());
+        assertNotNull(client2.ping().get());
 
+        client1.close();
         server.stop();
     }
 }