diff --git a/spring-context-support/src/test/java/org/springframework/cache/jcache/support/TestableCacheKeyGenerator.java b/spring-context-support/src/test/java/org/springframework/cache/jcache/support/TestableCacheKeyGenerator.java
index 0dc4a471e2..f045efdef3 100644
--- a/spring-context-support/src/test/java/org/springframework/cache/jcache/support/TestableCacheKeyGenerator.java
+++ b/spring-context-support/src/test/java/org/springframework/cache/jcache/support/TestableCacheKeyGenerator.java
@@ -23,6 +23,7 @@ public class TestableCacheKeyGenerator implements CacheKeyGenerator {
 	}
 
 
+	@SuppressWarnings("serial")
 	private static class SimpleGeneratedCacheKey extends SimpleKey implements GeneratedCacheKey {
 
 		public SimpleGeneratedCacheKey(Object... elements) {