diff --git a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/env/PropertySourceRuntimeHintsRegistrar.java b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/env/PropertySourceRuntimeHintsRegistrar.java
index 33181f29f32..f14aad54f01 100644
--- a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/env/PropertySourceRuntimeHintsRegistrar.java
+++ b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/env/PropertySourceRuntimeHintsRegistrar.java
@@ -30,7 +30,7 @@ class PropertySourceRuntimeHintsRegistrar implements RuntimeHintsRegistrar {
 	@Override
 	public void registerHints(RuntimeHints hints, ClassLoader classLoader) {
 		hints.reflection().registerTypeIfPresent(classLoader, "org.yaml.snakeyaml.Yaml",
-				hint -> hint.onReachableType(TypeReference.of(YamlPropertySourceLoader.class)));
+				(hint) -> hint.onReachableType(TypeReference.of(YamlPropertySourceLoader.class)));
 	}
 
 }