1 files changed, 3 insertions, 1 deletions

diff --git a/crypto/src/math/ec/custom/sec/SecT409FieldElement.cs b/crypto/src/math/ec/custom/sec/SecT409FieldElement.cs

index 581ea73df..f954f46e7 100644
--- a/crypto/src/math/ec/custom/sec/SecT409FieldElement.cs
+++ b/crypto/src/math/ec/custom/sec/SecT409FieldElement.cs
@@ -159,7 +159,9 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec
 
         public override ECFieldElement Sqrt()
         {
-            return SquarePow(M - 1);
+            ulong[] z = Nat448.Create64();
+            SecT409Field.Sqrt(x, z);
+            return new SecT409FieldElement(z);
         }
 
         public virtual int Representation