diff --git a/project/SparkBuild.scala b/project/SparkBuild.scala
index b5b0adf630b9eeb0050a95ee6a586946c89f28bb..61a05d375d99e82caf70842b26b4f06db5a5a07d 100644
--- a/project/SparkBuild.scala
+++ b/project/SparkBuild.scala
@@ -543,7 +543,7 @@ object TestSettings {
     javaOptions in Test += "-Dspark.ui.enabled=false",
     javaOptions in Test += "-Dspark.ui.showConsoleProgress=false",
     javaOptions in Test += "-Dspark.driver.allowMultipleContexts=true",
-    //javaOptions in Test += "-Dspark.unsafe.exceptionOnMemoryLeak=true",
+    javaOptions in Test += "-Dspark.unsafe.exceptionOnMemoryLeak=true",
     javaOptions in Test += "-Dsun.io.serialization.extendedDebugInfo=true",
     javaOptions in Test += "-Dderby.system.durability=test",
     javaOptions in Test ++= System.getProperties.filter(_._1 startsWith "spark")