diff --git a/apm-collector/apm-collector-core/src/test/java/org/skywalking/apm/collector/core/data/AbstractHashMessageTest.java b/apm-collector/apm-collector-core/src/test/java/org/skywalking/apm/collector/core/data/AbstractHashMessageTest.java
index c3cb32e31..41e645d76 100644
--- a/apm-collector/apm-collector-core/src/test/java/org/skywalking/apm/collector/core/data/AbstractHashMessageTest.java
+++ b/apm-collector/apm-collector-core/src/test/java/org/skywalking/apm/collector/core/data/AbstractHashMessageTest.java
@@ -20,7 +20,6 @@ package org.skywalking.apm.collector.core.data;
 
 import org.junit.Assert;
 import org.junit.Test;
-import org.skywalking.apm.collector.core.data.AbstractHashMessage;
 
 /**
  * @author wu-sheng