diff --git a/spring-boot-project/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/graphql/tester/GraphQlTesterAutoConfiguration.java b/spring-boot-project/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/graphql/tester/GraphQlTesterAutoConfiguration.java
index 196491299a1..ab70033a163 100644
--- a/spring-boot-project/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/graphql/tester/GraphQlTesterAutoConfiguration.java
+++ b/spring-boot-project/spring-boot-test-autoconfigure/src/main/java/org/springframework/boot/test/autoconfigure/graphql/tester/GraphQlTesterAutoConfiguration.java
@@ -50,7 +50,7 @@ public class GraphQlTesterAutoConfiguration {
 	public ExecutionGraphQlServiceTester graphQlTester(ExecutionGraphQlService graphQlService,
 			ObjectProvider<ObjectMapper> objectMapperProvider) {
 		ExecutionGraphQlServiceTester.Builder<?> builder = ExecutionGraphQlServiceTester.builder(graphQlService);
-		objectMapperProvider.ifAvailable(objectMapper -> {
+		objectMapperProvider.ifAvailable((objectMapper) -> {
 			final MediaType[] mediaTypes = new MediaType[] { MediaType.APPLICATION_JSON,
 					MediaType.APPLICATION_GRAPHQL };
 			builder.encoder(new Jackson2JsonEncoder(objectMapper, mediaTypes));