1 files changed, 5 insertions, 4 deletions
diff --git a/src/mscorlib/shared/System/DuplicateWaitObjectException.cs b/src/mscorlib/shared/System/DuplicateWaitObjectException.cs
index da29e2ad76..7eadead8c7 100644
--- a/src/mscorlib/shared/System/DuplicateWaitObjectException.cs
+++ b/src/mscorlib/shared/System/DuplicateWaitObjectException.cs
@@ -18,7 +18,6 @@ namespace System
     // The DuplicateWaitObjectException is thrown when an object 
     // appears more than once in the list of objects to WaitAll or WaitAny.
     // 
-    [Serializable]
     public class DuplicateWaitObjectException : ArgumentException
     {
         private static volatile String s_duplicateWaitObjectMessage = null;
@@ -58,8 +57,10 @@ namespace System
         {
             HResult = __HResults.COR_E_DUPLICATEWAITOBJECT;
         }
-
-        // This constructor is required for serialization
-        protected DuplicateWaitObjectException(SerializationInfo info, StreamingContext context) : base(info, context) { }
+        
+        protected DuplicateWaitObjectException(SerializationInfo info, StreamingContext context) : base(info, context)
+        {
+            throw new PlatformNotSupportedException();
+        }
     }
 }