diff --git a/core/src/test/scala/spark/ShuffleSuite.scala b/core/src/test/scala/spark/ShuffleSuite.scala
index 58c834c735d0a0c69369becb1784fdbd9f239fa1..fdee7ca38460554610b6d121c2d93fa22b3dca50 100644
--- a/core/src/test/scala/spark/ShuffleSuite.scala
+++ b/core/src/test/scala/spark/ShuffleSuite.scala
@@ -326,5 +326,5 @@ object ShuffleSuite {
     x + y
   }
 
-  class NonJavaSerializableClass(val value: Int) extends Serializable
+  class NonJavaSerializableClass(val value: Int)
 }