diff --git a/crypto/signature_nocgo.go b/crypto/signature_nocgo.go
index f40d928986..f70617019e 100644
--- a/crypto/signature_nocgo.go
+++ b/crypto/signature_nocgo.go
@@ -164,7 +164,7 @@ func S256() EllipticCurve {
 }
 
 type btCurve struct {
-	*btcec.btCurve
+	*btcec.KoblitzCurve
 }
 
 // Marshall converts a point given as (x, y) into a byte slice.