diff --git a/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/graphql/GraphQlProperties.java b/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/graphql/GraphQlProperties.java
index be698e1c96..34f247ec75 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/graphql/GraphQlProperties.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/graphql/GraphQlProperties.java
@@ -343,11 +343,11 @@ public class GraphQlProperties {
 
 	}
 
-	public static class DeprecatedSse {
+	public static final class DeprecatedSse {
 
 		private final Sse sse;
 
-		public DeprecatedSse(Sse sse) {
+		private DeprecatedSse(Sse sse) {
 			this.sse = sse;
 		}