diff --git a/core/src/main/scala/org/apache/spark/rdd/PartitionwiseSampledRDD.scala b/core/src/main/scala/org/apache/spark/rdd/PartitionwiseSampledRDD.scala
index 629f7074c17c50bc27a90ebafaa9d9c5f72ab7fd..a74309d861318a1bd2dfcb5d338a3fb13dc5a32f 100644
--- a/core/src/main/scala/org/apache/spark/rdd/PartitionwiseSampledRDD.scala
+++ b/core/src/main/scala/org/apache/spark/rdd/PartitionwiseSampledRDD.scala
@@ -45,7 +45,7 @@ class PartitionwiseSampledRDDPartition(val prev: Partition, val seed: Long)
 class PartitionwiseSampledRDD[T: ClassTag, U: ClassTag](
     prev: RDD[T],
     sampler: RandomSampler[T, U],
-    seed: Long = System.nanoTime)
+    @transient seed: Long = System.nanoTime)
   extends RDD[U](prev) {
 
   override def getPartitions: Array[Partition] = {
diff --git a/core/src/main/scala/org/apache/spark/rdd/ZippedWithIndexRDD.scala b/core/src/main/scala/org/apache/spark/rdd/ZippedWithIndexRDD.scala
index 5e08a469ee7bd0939b9bc4fcdf4df92fc3ee3680..38dc114d80812f60a61ed6b29910a1b816dda835 100644
--- a/core/src/main/scala/org/apache/spark/rdd/ZippedWithIndexRDD.scala
+++ b/core/src/main/scala/org/apache/spark/rdd/ZippedWithIndexRDD.scala
@@ -37,7 +37,7 @@ class ZippedWithIndexRDDPartition(val prev: Partition, val startIndex: Long)
  * @tparam T parent RDD item type
  */
 private[spark]
-class ZippedWithIndexRDD[T: ClassTag](prev: RDD[T]) extends RDD[(T, Long)](prev) {
+class ZippedWithIndexRDD[T: ClassTag](@transient prev: RDD[T]) extends RDD[(T, Long)](prev) {
 
   override def getPartitions: Array[Partition] = {
     val n = prev.partitions.size