diff --git a/apps/foo/src/main/java/org/onlab/onos/foo/SimpleNettyServer.java b/apps/foo/src/main/java/org/onlab/onos/foo/SimpleNettyServer.java
index fe8e058..25ac59b 100644
--- a/apps/foo/src/main/java/org/onlab/onos/foo/SimpleNettyServer.java
+++ b/apps/foo/src/main/java/org/onlab/onos/foo/SimpleNettyServer.java
@@ -8,7 +8,7 @@
 /**
  * Test to measure Messaging performance.
  */
-    public class SimpleNettyServer {
+    public final class SimpleNettyServer {
         private static Logger log = LoggerFactory.getLogger(IOLoopTestServer.class);
 
             private SimpleNettyServer() {}