diff --git a/smoke-test/spring-boot-smoke-test-actuator-custom-security/build.gradle b/smoke-test/spring-boot-smoke-test-actuator-custom-security/build.gradle
index 6cae3245b3a..36c1ddd6c8c 100644
--- a/smoke-test/spring-boot-smoke-test-actuator-custom-security/build.gradle
+++ b/smoke-test/spring-boot-smoke-test-actuator-custom-security/build.gradle
@@ -30,4 +30,8 @@ dependencies {
 	testImplementation(project(":starter:spring-boot-starter-test"))
 
 	testRuntimeOnly("org.apache.httpcomponents.client5:httpclient5")
-}
\ No newline at end of file
+}
+
+tasks.named("compileTestJava") {
+	options.nullability.checking = "tests"
+}
diff --git a/smoke-test/spring-boot-smoke-test-actuator-custom-security/src/test/java/smoketest/actuator/customsecurity/SampleActuatorCustomSecurityApplicationTests.java b/smoke-test/spring-boot-smoke-test-actuator-custom-security/src/test/java/smoketest/actuator/customsecurity/SampleActuatorCustomSecurityApplicationTests.java
index b40505f56d4..e2e9becc893 100644
--- a/smoke-test/spring-boot-smoke-test-actuator-custom-security/src/test/java/smoketest/actuator/customsecurity/SampleActuatorCustomSecurityApplicationTests.java
+++ b/smoke-test/spring-boot-smoke-test-actuator-custom-security/src/test/java/smoketest/actuator/customsecurity/SampleActuatorCustomSecurityApplicationTests.java
@@ -52,6 +52,7 @@ class SampleActuatorCustomSecurityApplicationTests extends AbstractSampleActuato
 		ResponseEntity<Map> entity = restTemplate().getForEntity(getPath() + "/foo", Map.class);
 		assertThat(entity.getStatusCode()).isEqualTo(HttpStatus.INTERNAL_SERVER_ERROR);
 		Map<String, Object> body = entity.getBody();
+		assertThat(body).isNotNull();
 		assertThat((String) body.get("message")).contains("Expected exception in controller");
 	}