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Diffstat (limited to 'crypto/src/math/ec/custom/sec/SecP192K1Field.cs')
-rw-r--r--crypto/src/math/ec/custom/sec/SecP192K1Field.cs2
1 files changed, 1 insertions, 1 deletions
diff --git a/crypto/src/math/ec/custom/sec/SecP192K1Field.cs b/crypto/src/math/ec/custom/sec/SecP192K1Field.cs
index bdcf0319e..9b3d12536 100644
--- a/crypto/src/math/ec/custom/sec/SecP192K1Field.cs
+++ b/crypto/src/math/ec/custom/sec/SecP192K1Field.cs
@@ -47,7 +47,7 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec
             uint[] z = Nat192.FromBigInteger(x);
             if (z[5] == P5 && Nat192.Gte(z, P))
             {
-                Nat192.AddDWord(PInv, z, 0);
+                Nat192.SubFrom(P, z);
             }
             return z;
         }