diff --git a/packages/bitcore-lib/lib/crypto/schnorr.js b/packages/bitcore-lib/lib/crypto/schnorr.js
index 3916a0dc29a..a4145ce5d67 100644
--- a/packages/bitcore-lib/lib/crypto/schnorr.js
+++ b/packages/bitcore-lib/lib/crypto/schnorr.js
@@ -63,7 +63,7 @@ Schnorr.sign = function(privateKey, message, aux) {
   const Rbuf = Buffer.from(R.encodeCompressed().slice(1)); // slice(1) removes the encoding prefix byte
   const k = R.y.isEven() ? kPrime : n.sub(kPrime);
   const e = new BN(new TaggedHash('BIP0340/challenge', Buffer.concat([Rbuf, Pbuf, message])).finalize()).mod(n);
-  const sig = Buffer.concat([Rbuf, k.add(e.mul(d)).mod(n).toBuffer()]);
+  const sig = Buffer.concat([Rbuf, k.add(e.mul(d)).mod(n).toBuffer({ size: 32 })]);
 
   if (!Schnorr.verify(Pbuf, message, sig)) {
     throw new Error('Error creating schnorr signature. Verification failed');
@@ -74,7 +74,7 @@ Schnorr.sign = function(privateKey, message, aux) {
 
 /**
  * Verify a schnorr signature
- * @param {PublicKey|Buffer} publicKey 
+ * @param {PublicKey|Buffer} publicKey
  * @param {String|Buffer} message Hex string or buffer
  * @param {String|Signature|Buffer} signature Hex string, Signature instance, or buffer
  * @returns {Boolean}
@@ -139,4 +139,4 @@ const getE = function(r, P, message) {
   return new BN(hash).mod(n);
 };
 
-module.exports = Schnorr;
\ No newline at end of file
+module.exports = Schnorr;