1 files changed, 3 insertions, 1 deletions

diff --git a/crypto/src/math/ec/custom/sec/SecT131FieldElement.cs b/crypto/src/math/ec/custom/sec/SecT131FieldElement.cs

index 0ea00ea07..e0ecc100f 100644
--- a/crypto/src/math/ec/custom/sec/SecT131FieldElement.cs
+++ b/crypto/src/math/ec/custom/sec/SecT131FieldElement.cs
@@ -159,7 +159,9 @@ namespace Org.BouncyCastle.Math.EC.Custom.Sec
 
         public override ECFieldElement Sqrt()
         {
-            return SquarePow(M - 1);
+            ulong[] z = Nat192.Create64();
+            SecT131Field.Sqrt(x, z);
+            return new SecT131FieldElement(z);
         }
 
         public virtual int Representation