1 files changed, 1 insertions, 1 deletions

diff --git a/crypto/src/security/SignatureException.cs b/crypto/src/security/SignatureException.cs

index cea3c59cd..3ad617dfd 100644
--- a/crypto/src/security/SignatureException.cs
+++ b/crypto/src/security/SignatureException.cs
@@ -2,7 +2,7 @@ using System;
 
 namespace Org.BouncyCastle.Security
 {
-#if !(NETCF_1_0 || NETCF_2_0 || SILVERLIGHT)
+#if !(NETCF_1_0 || NETCF_2_0 || SILVERLIGHT || PORTABLE)
     [Serializable]
 #endif
     public class SignatureException : GeneralSecurityException