diff --git a/core/src/main/java/com/taobao/arthas/core/command/monitor200/ThreadSampler.java b/core/src/main/java/com/taobao/arthas/core/command/monitor200/ThreadSampler.java
index 91fade566..ee75954a7 100644
--- a/core/src/main/java/com/taobao/arthas/core/command/monitor200/ThreadSampler.java
+++ b/core/src/main/java/com/taobao/arthas/core/command/monitor200/ThreadSampler.java
@@ -124,6 +124,7 @@ public class ThreadSampler {
 
         // Sort by CPU time : should be a rendering hint...
         Collections.sort(threads, new Comparator<ThreadVO>() {
+            @Override
             public int compare(ThreadVO o1, ThreadVO o2) {
                 long l1 = deltas.get(o1);
                 long l2 = deltas.get(o2);