diff --git a/spring-geode-autoconfigure/src/test/java/org/springframework/geode/boot/autoconfigure/security/auth/http/HttpBasicAuthenticationSecurityConfigurationUnitTests.java b/spring-geode-autoconfigure/src/test/java/org/springframework/geode/boot/autoconfigure/security/auth/http/HttpBasicAuthenticationSecurityConfigurationUnitTests.java
index 91d21699..2e606050 100644
--- a/spring-geode-autoconfigure/src/test/java/org/springframework/geode/boot/autoconfigure/security/auth/http/HttpBasicAuthenticationSecurityConfigurationUnitTests.java
+++ b/spring-geode-autoconfigure/src/test/java/org/springframework/geode/boot/autoconfigure/security/auth/http/HttpBasicAuthenticationSecurityConfigurationUnitTests.java
@@ -68,7 +68,7 @@ import org.springframework.web.client.RestTemplate;
 @SuppressWarnings("deprecation")
 public class HttpBasicAuthenticationSecurityConfigurationUnitTests {
 
-	private TestHttpBasicAuthenticationSecurityConfiguration httpSecurityConfiguration =
+	private final TestHttpBasicAuthenticationSecurityConfiguration httpSecurityConfiguration =
 		spy(new TestHttpBasicAuthenticationSecurityConfiguration());
 
 	private <T> T constructInstance(Class<T> type, Class<?>[] parameterTypes, Object... args)