1 files changed, 4 insertions, 2 deletions
diff --git a/src/mscorlib/shared/System/NotImplementedException.cs b/src/mscorlib/shared/System/NotImplementedException.cs
index 4d141eac8c..ae62527fac 100644
--- a/src/mscorlib/shared/System/NotImplementedException.cs
+++ b/src/mscorlib/shared/System/NotImplementedException.cs
@@ -16,7 +16,6 @@ using System.Runtime.Serialization;
 
 namespace System
 {
-    [Serializable]
     public class NotImplementedException : SystemException
     {
         public NotImplementedException()
@@ -35,6 +34,9 @@ namespace System
             HResult = __HResults.E_NOTIMPL;
         }
 
-        protected NotImplementedException(SerializationInfo info, StreamingContext context) : base(info, context) { }
+        protected NotImplementedException(SerializationInfo info, StreamingContext context) : base(info, context)
+        {
+            throw new PlatformNotSupportedException();
+        }
     }
 }