1 files changed, 1 insertions, 1 deletions
diff --git a/src/mscorlib/shared/System/Threading/SynchronizationLockException.cs b/src/mscorlib/shared/System/Threading/SynchronizationLockException.cs
index 120577fdcf..c64fc9ced8 100644
--- a/src/mscorlib/shared/System/Threading/SynchronizationLockException.cs
+++ b/src/mscorlib/shared/System/Threading/SynchronizationLockException.cs
@@ -16,7 +16,6 @@ using System.Runtime.Serialization;
 
 namespace System.Threading
 {
-    [Serializable]
     public class SynchronizationLockException : SystemException
     {
         public SynchronizationLockException()
@@ -39,6 +38,7 @@ namespace System.Threading
 
         protected SynchronizationLockException(SerializationInfo info, StreamingContext context) : base(info, context)
         {
+            throw new PlatformNotSupportedException();
         }
     }
 }