1 files changed, 5 insertions, 0 deletions
diff --git a/crypto/src/asn1/DerOutputStream.cs b/crypto/src/asn1/DerOutputStream.cs
index b8cbe9ee2..f384c20a8 100644
--- a/crypto/src/asn1/DerOutputStream.cs
+++ b/crypto/src/asn1/DerOutputStream.cs
@@ -39,6 +39,11 @@ namespace Org.BouncyCastle.Asn1
             get { return false; }
         }
 
+        internal override bool IsDer
+        {
+            get { return true; }
+        }
+
         internal override void WritePrimitive(Asn1Object primitive, bool withID)
         {
             Asn1Set asn1Set = primitive as Asn1Set;