diff --git a/src/Microsoft.Actions.Actors/Communication/ActorMessageBodyDataContractSerializationProvider.cs b/src/Microsoft.Actions.Actors/Communication/ActorMessageBodyDataContractSerializationProvider.cs
index a7436ce1..4d475fc5 100644
--- a/src/Microsoft.Actions.Actors/Communication/ActorMessageBodyDataContractSerializationProvider.cs
+++ b/src/Microsoft.Actions.Actors/Communication/ActorMessageBodyDataContractSerializationProvider.cs
@@ -15,7 +15,7 @@ namespace Microsoft.Actions.Actors.Communication
     /// This is the implmentation  for <see cref="IActorMessageBodySerializationProvider"/>used by remoting service and client during
     /// request/response serialization . It uses request Wrapping and data contract for serialization.
     /// </summary>
-    public class ActorMessageBodyDataContractSerializationProvider : IActorMessageBodySerializationProvider
+    internal class ActorMessageBodyDataContractSerializationProvider : IActorMessageBodySerializationProvider
     {
         private static readonly IEnumerable<Type> DefaultKnownTypes = new[]
         {
diff --git a/src/Microsoft.Actions.Actors/Communication/IActorMessageBodySerializationProvider.cs b/src/Microsoft.Actions.Actors/Communication/IActorMessageBodySerializationProvider.cs
index 2b062309..ce666af0 100644
--- a/src/Microsoft.Actions.Actors/Communication/IActorMessageBodySerializationProvider.cs
+++ b/src/Microsoft.Actions.Actors/Communication/IActorMessageBodySerializationProvider.cs
@@ -11,7 +11,7 @@ namespace Microsoft.Actions.Actors.Communication
     /// <summary>
     /// Defines the interface that must be implemented for providing custom serialization for the remoting request.
     /// </summary>
-    public interface IActorMessageBodySerializationProvider
+    internal interface IActorMessageBodySerializationProvider
     {
         /// <summary>
         /// Create a IServiceRemotingMessageBodyFactory used for creating remoting request and response body.