diff --git a/crypto/src/cms/CMSSignedDataGenerator.cs b/crypto/src/cms/CMSSignedDataGenerator.cs
index f2676a4409..c0a04e2761 100644
--- a/crypto/src/cms/CMSSignedDataGenerator.cs
+++ b/crypto/src/cms/CMSSignedDataGenerator.cs
@@ -96,7 +96,7 @@ internal SignerInf(
 
             internal AlgorithmIdentifier DigestAlgorithmID
 			{
-				get { return new AlgorithmIdentifier(new DerObjectIdentifier(digestOID), DerNull.Instance); }
+				get { return new AlgorithmIdentifier(new DerObjectIdentifier(digestOID)); }
 			}
 
 			internal CmsAttributeTableGenerator SignedAttributes