diff --git a/spring-session-core/src/main/java/org/springframework/session/web/http/CookieSerializer.java b/spring-session-core/src/main/java/org/springframework/session/web/http/CookieSerializer.java
index f05bb29a..2e8b880a 100644
--- a/spring-session-core/src/main/java/org/springframework/session/web/http/CookieSerializer.java
+++ b/spring-session-core/src/main/java/org/springframework/session/web/http/CookieSerializer.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2017 the original author or authors.
+ * Copyright 2014-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -78,7 +78,7 @@ public interface CookieSerializer {
 		 * modified by the {@link CookieSerializer} when writing to the actual cookie so
 		 * long as the original value is returned when the cookie is read.
 		 */
-		CookieValue(HttpServletRequest request, HttpServletResponse response,
+		public CookieValue(HttpServletRequest request, HttpServletResponse response,
 				String cookieValue) {
 			this.request = request;
 			this.response = response;