1 files changed, 1 insertions, 1 deletions
diff --git a/src/mscorlib/shared/System/Threading/WaitHandleCannotBeOpenedException.cs b/src/mscorlib/shared/System/Threading/WaitHandleCannotBeOpenedException.cs
index e44946a669..770e70d7ab 100644
--- a/src/mscorlib/shared/System/Threading/WaitHandleCannotBeOpenedException.cs
+++ b/src/mscorlib/shared/System/Threading/WaitHandleCannotBeOpenedException.cs
@@ -6,7 +6,6 @@ using System.Runtime.Serialization;
 
 namespace System.Threading
 {
-    [Serializable]
     public class WaitHandleCannotBeOpenedException : ApplicationException
     {
         public WaitHandleCannotBeOpenedException() : base(SR.Threading_WaitHandleCannotBeOpenedException)
@@ -26,6 +25,7 @@ namespace System.Threading
 
         protected WaitHandleCannotBeOpenedException(SerializationInfo info, StreamingContext context) : base(info, context)
         {
+            throw new PlatformNotSupportedException();
         }
     }
 }