1 files changed, 3 insertions, 2 deletions
diff --git a/crypto/src/math/ec/custom/sec/SecT233FieldElement.cs b/crypto/src/math/ec/custom/sec/SecT233FieldElement.cs
index 60b204604..a9041efde 100644
--- a/crypto/src/math/ec/custom/sec/SecT233FieldElement.cs
+++ b/crypto/src/math/ec/custom/sec/SecT233FieldElement.cs
@@ -152,8 +152,9 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec
 
         public override ECFieldElement Invert()
         {
-            return new SecT233FieldElement(
-                AbstractF2mCurve.Inverse(233, new int[] { 74 }, ToBigInteger()));
+            ulong[] z = Nat256.Create64();
+            SecT233Field.Invert(x, z);
+            return new SecT233FieldElement(z);
         }
 
         public override ECFieldElement Sqrt()