diff --git a/src/net45/WampSharp.WAMP1/WAMP1/V1/Api/Server/WampRequestContext.cs b/src/net45/WampSharp.WAMP1/WAMP1/V1/Api/Server/WampRequestContext.cs
index 9c7759fcd..5080f6cde 100644
--- a/src/net45/WampSharp.WAMP1/WAMP1/V1/Api/Server/WampRequestContext.cs
+++ b/src/net45/WampSharp.WAMP1/WAMP1/V1/Api/Server/WampRequestContext.cs
@@ -1,9 +1,13 @@
-using System.Runtime.Remoting.Messaging;
+using System;
+using System.Runtime.Remoting.Messaging;
 using WampSharp.V1.Core.Contracts;
 using WampSharp.V1.Cra;
 
 namespace WampSharp.V1
 {
+#if !PCL
+    [Serializable]
+#endif
     public class WampRequestContext
     {
         #region Static Members
diff --git a/src/net45/WampSharp/WAMP2/V2/Api/WampEventContext.cs b/src/net45/WampSharp/WAMP2/V2/Api/WampEventContext.cs
index 36f5be86d..aabb7bb41 100644
--- a/src/net45/WampSharp/WAMP2/V2/Api/WampEventContext.cs
+++ b/src/net45/WampSharp/WAMP2/V2/Api/WampEventContext.cs
@@ -9,6 +9,9 @@ namespace WampSharp.V2
     /// <summary>
     /// Includes information about the current event.
     /// </summary>
+#if !PCL
+    [Serializable]
+#endif
     public class WampEventContext
     {
 
diff --git a/src/net45/WampSharp/WAMP2/V2/Api/WampInvocationContext.cs b/src/net45/WampSharp/WAMP2/V2/Api/WampInvocationContext.cs
index fe506bee1..db01a14eb 100644
--- a/src/net45/WampSharp/WAMP2/V2/Api/WampInvocationContext.cs
+++ b/src/net45/WampSharp/WAMP2/V2/Api/WampInvocationContext.cs
@@ -10,6 +10,9 @@ namespace WampSharp.V2
     /// <summary>
     /// Includes information about the current invocation.
     /// </summary>
+#if !PCL
+    [Serializable]
+#endif
     public class WampInvocationContext
     {
         #region Static Members