diff --git a/spring-cloud-kubernetes-discovery/src/main/java/org/springframework/cloud/kubernetes/discovery/KubernetesDiscoveryClient.java b/spring-cloud-kubernetes-discovery/src/main/java/org/springframework/cloud/kubernetes/discovery/KubernetesDiscoveryClient.java
index b22ea869a..207919519 100644
--- a/spring-cloud-kubernetes-discovery/src/main/java/org/springframework/cloud/kubernetes/discovery/KubernetesDiscoveryClient.java
+++ b/spring-cloud-kubernetes-discovery/src/main/java/org/springframework/cloud/kubernetes/discovery/KubernetesDiscoveryClient.java
@@ -18,6 +18,7 @@
 
 import java.util.Arrays;
 import java.util.List;
+import java.util.Set;
 import java.util.stream.Collectors;
 
 import org.springframework.cloud.client.ServiceInstance;
@@ -32,17 +33,20 @@ public class KubernetesDiscoveryClient implements DiscoveryClient {
 
 	private final RestTemplate rest;
 
-	private final KubernetesDiscoveryClientProperties properties;
-
 	private final boolean emptyNamespaces;
 
+	private final Set<String> namespaces;
+
+	private final String discoveryServerUrl;
+
 	public KubernetesDiscoveryClient(RestTemplate rest, KubernetesDiscoveryClientProperties properties) {
 		if (!StringUtils.hasText(properties.getDiscoveryServerUrl())) {
 			throw new DiscoveryServerUrlInvalidException();
 		}
 		this.rest = rest;
-		this.properties = properties;
 		this.emptyNamespaces = properties.getNamespaces().isEmpty();
+		this.namespaces = properties.getNamespaces();
+		this.discoveryServerUrl = properties.getDiscoveryServerUrl();
 	}
 
 	@Override
@@ -53,7 +57,7 @@ public String description() {
 	@Override
 	public List<ServiceInstance> getInstances(String serviceId) {
 		KubernetesServiceInstance[] responseBody = rest.getForEntity(
-				properties.getDiscoveryServerUrl() + "/apps/" + serviceId, KubernetesServiceInstance[].class).getBody();
+				discoveryServerUrl + "/apps/" + serviceId, KubernetesServiceInstance[].class).getBody();
 		if (responseBody != null && responseBody.length > 0) {
 			return Arrays.stream(responseBody).filter(this::matchNamespaces).collect(Collectors.toList());
 		}
@@ -62,7 +66,7 @@ public List<ServiceInstance> getInstances(String serviceId) {
 
 	@Override
 	public List<String> getServices() {
-		Service[] services = rest.getForEntity(properties.getDiscoveryServerUrl() + "/apps", Service[].class).getBody();
+		Service[] services = rest.getForEntity(discoveryServerUrl + "/apps", Service[].class).getBody();
 		if (services != null && services.length > 0) {
 			return Arrays.stream(services).filter(this::matchNamespaces).map(Service::getName)
 					.collect(Collectors.toList());
@@ -71,14 +75,12 @@ public List<String> getServices() {
 	}
 
 	private boolean matchNamespaces(KubernetesServiceInstance kubernetesServiceInstance) {
-		return emptyNamespaces || properties.getNamespaces().contains(kubernetesServiceInstance.getNamespace());
+		return emptyNamespaces || namespaces.contains(kubernetesServiceInstance.getNamespace());
 	}
 
 	private boolean matchNamespaces(Service service) {
-		if (service.getServiceInstances().isEmpty()) {
-			return true;
-		}
-		return service.getServiceInstances().stream().anyMatch(this::matchNamespaces);
+		return service.getServiceInstances().isEmpty() ||
+			service.getServiceInstances().stream().anyMatch(this::matchNamespaces);
 	}
 
 }
diff --git a/spring-cloud-kubernetes-discovery/src/main/java/org/springframework/cloud/kubernetes/discovery/KubernetesDiscoveryClientProperties.java b/spring-cloud-kubernetes-discovery/src/main/java/org/springframework/cloud/kubernetes/discovery/KubernetesDiscoveryClientProperties.java
index 94261df90..91c1d9b34 100644
--- a/spring-cloud-kubernetes-discovery/src/main/java/org/springframework/cloud/kubernetes/discovery/KubernetesDiscoveryClientProperties.java
+++ b/spring-cloud-kubernetes-discovery/src/main/java/org/springframework/cloud/kubernetes/discovery/KubernetesDiscoveryClientProperties.java
@@ -16,7 +16,7 @@
 
 package org.springframework.cloud.kubernetes.discovery;
 
-import java.util.List;
+import java.util.Set;
 
 import org.springframework.boot.context.properties.ConfigurationProperties;
 
@@ -34,7 +34,7 @@ public class KubernetesDiscoveryClientProperties {
 	 * If set then only the services and endpoints matching these namespaces will be
 	 * fetched from the Kubernetes API server.
 	 */
-	private List<String> namespaces = List.of();
+	private Set<String> namespaces = Set.of();
 
 	public String getDiscoveryServerUrl() {
 		return discoveryServerUrl;
@@ -52,11 +52,11 @@ public void setEnabled(boolean enabled) {
 		this.enabled = enabled;
 	}
 
-	List<String> getNamespaces() {
+	Set<String> getNamespaces() {
 		return namespaces;
 	}
 
-	void setNamespaces(List<String> namespaces) {
+	void setNamespaces(Set<String> namespaces) {
 		this.namespaces = namespaces;
 	}
 
diff --git a/spring-cloud-kubernetes-discovery/src/test/java/org/springframework/cloud/kubernetes/discovery/KubernetesDiscoveryClientTests.java b/spring-cloud-kubernetes-discovery/src/test/java/org/springframework/cloud/kubernetes/discovery/KubernetesDiscoveryClientTests.java
index 6a81b4835..c64de7ec6 100644
--- a/spring-cloud-kubernetes-discovery/src/test/java/org/springframework/cloud/kubernetes/discovery/KubernetesDiscoveryClientTests.java
+++ b/spring-cloud-kubernetes-discovery/src/test/java/org/springframework/cloud/kubernetes/discovery/KubernetesDiscoveryClientTests.java
@@ -20,6 +20,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 import java.util.stream.Stream;
 
 import com.github.tomakehurst.wiremock.WireMockServer;
@@ -137,7 +138,7 @@ void getServices() {
 
 	@ParameterizedTest
 	@MethodSource("servicesFilteredByNamespacesSource")
-	void getServicesFilteredByNamespaces(List<String> namespaces, List<String> expectedServices) {
+	void getServicesFilteredByNamespaces(Set<String> namespaces, List<String> expectedServices) {
 		RestTemplate rest = new RestTemplateBuilder().build();
 		KubernetesDiscoveryClientProperties properties = new KubernetesDiscoveryClientProperties();
 		properties.setNamespaces(namespaces);
@@ -146,16 +147,9 @@ void getServicesFilteredByNamespaces(List<String> namespaces, List<String> expec
 		assertThat(discoveryClient.getServices()).containsExactlyInAnyOrderElementsOf(expectedServices);
 	}
 
-	static Stream<Arguments> servicesFilteredByNamespacesSource() {
-		return Stream.of(Arguments.of(List.of(), List.of("test-svc-1", "test-svc-3")),
-				Arguments.of(List.of("namespace1", "namespace2"), List.of("test-svc-1", "test-svc-3")),
-				Arguments.of(List.of("namespace1"), List.of("test-svc-1")),
-				Arguments.of(List.of("namespace2", "does-not-exist"), List.of("test-svc-3")));
-	}
-
 	@ParameterizedTest
 	@MethodSource("instancesFilteredByNamespacesSource")
-	void getInstancesFilteredByNamespaces(List<String> namespaces, String serviceId, List<String> expectedInstances) {
+	void getInstancesFilteredByNamespaces(Set<String> namespaces, String serviceId, List<String> expectedInstances) {
 		RestTemplate rest = new RestTemplateBuilder().build();
 		KubernetesDiscoveryClientProperties properties = new KubernetesDiscoveryClientProperties();
 		properties.setNamespaces(namespaces);
@@ -165,10 +159,17 @@ void getInstancesFilteredByNamespaces(List<String> namespaces, String serviceId,
 				.containsExactlyInAnyOrderElementsOf(expectedInstances);
 	}
 
-	static Stream<Arguments> instancesFilteredByNamespacesSource() {
-		return Stream.of(Arguments.of(List.of(), "test-svc-3", List.of("uid2")),
-				Arguments.of(List.of("namespace1"), "test-svc-3", List.of()),
-				Arguments.of(List.of("namespace2"), "test-svc-3", List.of("uid2")));
+	private static Stream<Arguments> servicesFilteredByNamespacesSource() {
+		return Stream.of(Arguments.of(Set.of(), List.of("test-svc-1", "test-svc-3")),
+			Arguments.of(Set.of("namespace1", "namespace2"), List.of("test-svc-1", "test-svc-3")),
+			Arguments.of(Set.of("namespace1"), List.of("test-svc-1")),
+			Arguments.of(Set.of("namespace2", "does-not-exist"), List.of("test-svc-3")));
+	}
+
+	private static Stream<Arguments> instancesFilteredByNamespacesSource() {
+		return Stream.of(Arguments.of(Set.of(), "test-svc-3", List.of("uid2")),
+				Arguments.of(Set.of("namespace1"), "test-svc-3", List.of()),
+				Arguments.of(Set.of("namespace2"), "test-svc-3", List.of("uid2")));
 	}
 
 }