diff --git a/lib/crypto/ecdsa.js b/lib/crypto/ecdsa.js
index 9ab220d..42fa774 100644
--- a/lib/crypto/ecdsa.js
+++ b/lib/crypto/ecdsa.js
@@ -100,6 +100,7 @@ ECDSA.prototype.deterministicK = function(badrs) {
   for (var i = 0; i < badrs || !(T.lt(N) && T.gt(0)); i++) {
     k = Hash.sha256hmac(Buffer.concat([v, new Buffer([0x00])]), k);
     v = Hash.sha256hmac(v, k);
+    v = Hash.sha256hmac(v, k);
     T = BN.fromBuffer(v);
   }