1 files changed, 5 insertions, 0 deletions
diff --git a/crypto/src/asn1/x509/AltSignatureAlgorithm.cs b/crypto/src/asn1/x509/AltSignatureAlgorithm.cs
index 0844de324..ad5e380af 100644
--- a/crypto/src/asn1/x509/AltSignatureAlgorithm.cs
+++ b/crypto/src/asn1/x509/AltSignatureAlgorithm.cs
@@ -55,6 +55,11 @@ namespace Org.BouncyCastle.Asn1.X509
             m_algorithm = algorithm;
         }
 
+        public AltSignatureAlgorithm(DerObjectIdentifier algorithm)
+            : this(algorithm, null)
+        {
+        }
+
         public AltSignatureAlgorithm(DerObjectIdentifier algorithm, Asn1Encodable parameters)
         {
             m_algorithm = new AlgorithmIdentifier(algorithm, parameters);