1 files changed, 1 insertions, 1 deletions
diff --git a/src/mscorlib/shared/System/Threading/ThreadStateException.cs b/src/mscorlib/shared/System/Threading/ThreadStateException.cs
index 33bc8baee6..9477cb1ae4 100644
--- a/src/mscorlib/shared/System/Threading/ThreadStateException.cs
+++ b/src/mscorlib/shared/System/Threading/ThreadStateException.cs
@@ -16,7 +16,6 @@ using System.Runtime.Serialization;
 
 namespace System.Threading
 {
-    [Serializable]
     public class ThreadStateException : SystemException
     {
         public ThreadStateException()
@@ -40,6 +39,7 @@ namespace System.Threading
         protected ThreadStateException(SerializationInfo info, StreamingContext context)
             : base(info, context)
         {
+            throw new PlatformNotSupportedException();
         }
     }
 }