diff --git a/java/src/main/java/org/msgpack/object/RawType.java b/java/src/main/java/org/msgpack/object/RawType.java
index 26f6e0d9..f6866c46 100644
--- a/java/src/main/java/org/msgpack/object/RawType.java
+++ b/java/src/main/java/org/msgpack/object/RawType.java
@@ -1,7 +1,7 @@
 //
 // MessagePack for Java
 //
-// Copyright (C) 2009-2010 FURUHASHI Sadayuki
+// Copyright (C) 2009-2011 FURUHASHI Sadayuki
 //
 //    Licensed under the Apache License, Version 2.0 (the "License");
 //    you may not use this file except in compliance with the License.
@@ -79,7 +79,7 @@ public class RawType extends MessagePackObject {
 
 	@Override
 	public int hashCode() {
-		return bytes.hashCode();
+		return Arrays.hashCode(bytes);
 	}
 
 	@Override