1 files changed, 1 insertions, 1 deletions

diff --git a/crypto/src/crypto/signers/X931Signer.cs b/crypto/src/crypto/signers/X931Signer.cs

index 36483fe17..c6e44bad8 100644
--- a/crypto/src/crypto/signers/X931Signer.cs
+++ b/crypto/src/crypto/signers/X931Signer.cs
@@ -190,7 +190,7 @@ namespace Org.BouncyCastle.Crypto.Signers
                 return false;
             }
 
-            BigInteger t = new BigInteger(block);
+            BigInteger t = new BigInteger(1, block);
             BigInteger f;
 
             if ((t.IntValue & 15) == 12)