1 files changed, 1 insertions, 1 deletions
diff --git a/src/mscorlib/shared/System/IO/DirectoryNotFoundException.cs b/src/mscorlib/shared/System/IO/DirectoryNotFoundException.cs
index 786c2106a3..de09760fcb 100644
--- a/src/mscorlib/shared/System/IO/DirectoryNotFoundException.cs
+++ b/src/mscorlib/shared/System/IO/DirectoryNotFoundException.cs
@@ -12,7 +12,6 @@ namespace System.IO
      * the Win32 errorcode-as-HRESULT ERROR_PATH_NOT_FOUND (0x80070003) 
      * and STG_E_PATHNOTFOUND (0x80030003).
      */
-    [Serializable]
     public class DirectoryNotFoundException : IOException
     {
         public DirectoryNotFoundException()
@@ -36,6 +35,7 @@ namespace System.IO
         protected DirectoryNotFoundException(SerializationInfo info, StreamingContext context)
             : base(info, context)
         {
+            throw new PlatformNotSupportedException();
         }
     }
 }