diff --git a/src/main/java/de/hottis/common/JmsTopic.java b/src/main/java/de/hottis/common/JmsTopic.java
index a6fc625..5ab300e 100644
--- a/src/main/java/de/hottis/common/JmsTopic.java
+++ b/src/main/java/de/hottis/common/JmsTopic.java
@@ -25,8 +25,8 @@ public class JmsTopic<T extends Serializable> implements MyQueue<T> {
 	
 	final protected Logger logger = LogManager.getRootLogger();
 
-	private String clientId;
-	private Properties config;
+	private final String clientId;
+	private final Properties config;
 	private Connection connection;
 	private Session session;
 	private Topic topic;