diff --git a/java/runtime/src/main/java/io/ray/runtime/util/SerializerTest.java b/java/runtime/src/test/java/io/ray/runtime/serializer/SerializerTest.java
similarity index 98%
rename from java/runtime/src/main/java/io/ray/runtime/util/SerializerTest.java
rename to java/runtime/src/test/java/io/ray/runtime/serializer/SerializerTest.java
index c85528278..f4b4f6934 100644
--- a/java/runtime/src/main/java/io/ray/runtime/util/SerializerTest.java
+++ b/java/runtime/src/test/java/io/ray/runtime/serializer/SerializerTest.java
@@ -1,4 +1,4 @@
-package io.ray.runtime.util;
+package io.ray.runtime.serializer;
 
 import io.ray.runtime.serializer.Serializer;
 import java.util.ArrayList;