diff --git a/core/src/main/scala/org/apache/spark/rpc/RpcEnv.scala b/core/src/main/scala/org/apache/spark/rpc/RpcEnv.scala
index 5149cf14684ac..105e35f4b9eb4 100644
--- a/core/src/main/scala/org/apache/spark/rpc/RpcEnv.scala
+++ b/core/src/main/scala/org/apache/spark/rpc/RpcEnv.scala
@@ -242,7 +242,7 @@ private[spark] class RpcTimeout(timeout: FiniteDuration, description: String) {
 }
 
 
-object RpcTimeout {
+private[spark] object RpcTimeout {
 
   private[this] val messagePrefix = "This timeout is controlled by "