1 files changed, 4 insertions, 2 deletions
diff --git a/src/mscorlib/shared/System/SystemException.cs b/src/mscorlib/shared/System/SystemException.cs
index f4779a2cd4..d5bcde7efc 100644
--- a/src/mscorlib/shared/System/SystemException.cs
+++ b/src/mscorlib/shared/System/SystemException.cs
@@ -6,7 +6,6 @@ using System.Runtime.Serialization;
 
 namespace System
 {
-    [Serializable]
     public class SystemException : Exception
     {
         public SystemException()
@@ -27,6 +26,9 @@ namespace System
             HResult = __HResults.COR_E_SYSTEM;
         }
 
-        protected SystemException(SerializationInfo info, StreamingContext context) : base(info, context) { }
+        protected SystemException(SerializationInfo info, StreamingContext context) : base(info, context)
+        {
+            throw new PlatformNotSupportedException();
+        }
     }
 }