diff --git a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/bind/BindableRuntimeHintsRegistrarTests.java b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/bind/BindableRuntimeHintsRegistrarTests.java
index 299f36649f..f8f6c0884c 100644
--- a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/bind/BindableRuntimeHintsRegistrarTests.java
+++ b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/bind/BindableRuntimeHintsRegistrarTests.java
@@ -420,7 +420,7 @@ class BindableRuntimeHintsRegistrarTests {
 
 	}
 
-	public class WithWellKnownTypes implements ApplicationContextAware, EnvironmentAware {
+	public static class WithWellKnownTypes implements ApplicationContextAware, EnvironmentAware {
 
 		private ApplicationContext applicationContext;