diff --git a/spring-cloud-commons/src/main/java/org/springframework/cloud/client/DefaultServiceInstance.java b/spring-cloud-commons/src/main/java/org/springframework/cloud/client/DefaultServiceInstance.java
index 89b200af..53d182ec 100644
--- a/spring-cloud-commons/src/main/java/org/springframework/cloud/client/DefaultServiceInstance.java
+++ b/spring-cloud-commons/src/main/java/org/springframework/cloud/client/DefaultServiceInstance.java
@@ -27,6 +27,7 @@ import java.util.Objects;
  * @author Spencer Gibb
  * @author Tim Ysewyn
  * @author Charu Covindane
+ * @author Neil Powell
  */
 public class DefaultServiceInstance implements ServiceInstance {
 
@@ -79,11 +80,15 @@ public class DefaultServiceInstance implements ServiceInstance {
 	/**
 	 * Creates a URI from the given ServiceInstance's host:port.
 	 * @param instance the ServiceInstance.
-	 * @return URI of the form (secure)?https:http + "host:port".
+	 * @return URI of the form (secure)?https:http + "host:port". Scheme port default used if port not set.
 	 */
 	public static URI getUri(ServiceInstance instance) {
 		String scheme = (instance.isSecure()) ? "https" : "http";
-		String uri = String.format("%s://%s:%s", scheme, instance.getHost(), instance.getPort());
+		int port = instance.getPort();
+		if (port <= 0) {
+		    port = (instance.isSecure()) ? 443 : 80;
+		}
+		String uri = String.format("%s://%s:%s", scheme, instance.getHost(), port);
 		return URI.create(uri);
 	}
 
diff --git a/spring-cloud-commons/src/test/java/org/springframework/cloud/client/discovery/simple/SimpleDiscoveryClientTests.java b/spring-cloud-commons/src/test/java/org/springframework/cloud/client/discovery/simple/SimpleDiscoveryClientTests.java
index 1ce47c98..01de3619 100644
--- a/spring-cloud-commons/src/test/java/org/springframework/cloud/client/discovery/simple/SimpleDiscoveryClientTests.java
+++ b/spring-cloud-commons/src/test/java/org/springframework/cloud/client/discovery/simple/SimpleDiscoveryClientTests.java
@@ -33,6 +33,7 @@ import static org.assertj.core.api.BDDAssertions.then;
 /**
  * @author Biju Kunjummen
  * @author Charu Covindane
+ * @author Neil Powell
  */
 public class SimpleDiscoveryClientTests {
 
@@ -44,8 +45,9 @@ public class SimpleDiscoveryClientTests {
 
 		Map<String, List<DefaultServiceInstance>> map = new HashMap<>();
 		DefaultServiceInstance service1Inst1 = new DefaultServiceInstance(null, null, "host1", 8080, false);
-		DefaultServiceInstance service1Inst2 = new DefaultServiceInstance(null, null, "host2", 8443, true);
-		map.put("service1", Arrays.asList(service1Inst1, service1Inst2));
+		DefaultServiceInstance service1Inst2 = new DefaultServiceInstance(null, null, "host2", 0, true);
+		DefaultServiceInstance service1Inst3 = new DefaultServiceInstance(null, null, "host3", 0, false);
+		map.put("service1", Arrays.asList(service1Inst1, service1Inst2, service1Inst3));
 		simpleDiscoveryProperties.setInstances(map);
 		simpleDiscoveryProperties.afterPropertiesSet();
 		this.simpleDiscoveryClient = new SimpleDiscoveryClient(simpleDiscoveryProperties);
@@ -54,13 +56,27 @@ public class SimpleDiscoveryClientTests {
 	@Test
 	public void shouldBeAbleToRetrieveServiceDetailsByName() {
 		List<ServiceInstance> instances = this.simpleDiscoveryClient.getInstances("service1");
-		then(instances.size()).isEqualTo(2);
+		then(instances.size()).isEqualTo(3);
 		then(instances.get(0).getServiceId()).isEqualTo("service1");
 		then(instances.get(0).getHost()).isEqualTo("host1");
 		then(instances.get(0).getPort()).isEqualTo(8080);
 		then(instances.get(0).getUri()).isEqualTo(URI.create("http://host1:8080"));
 		then(instances.get(0).isSecure()).isEqualTo(false);
 		then(instances.get(0).getMetadata()).isNotNull();
+
+		then(instances.get(1).getServiceId()).isEqualTo("service1");
+		then(instances.get(1).getHost()).isEqualTo("host2");
+		then(instances.get(1).getPort()).isEqualTo(0);
+		then(instances.get(1).getUri()).isEqualTo(URI.create("https://host2:443"));
+		then(instances.get(1).isSecure()).isEqualTo(true);
+		then(instances.get(1).getMetadata()).isNotNull();
+		
+		then(instances.get(2).getServiceId()).isEqualTo("service1");
+		then(instances.get(2).getHost()).isEqualTo("host3");
+		then(instances.get(2).getPort()).isEqualTo(0);
+		then(instances.get(2).getUri()).isEqualTo(URI.create("http://host3:80"));
+		then(instances.get(2).isSecure()).isEqualTo(false);
+		then(instances.get(2).getMetadata()).isNotNull();
 	}
 
 }