diff --git a/lib/orders/H004/response.js b/lib/orders/H004/response.js
index 66239df..eddaa3b 100644
--- a/lib/orders/H004/response.js
+++ b/lib/orders/H004/response.js
@@ -126,8 +126,9 @@ module.exports = (xml, keys) => ({
 			const type = lastChild(keyNodes[i].parentNode).textContent;
 			const modulus = xpath.select(".//*[local-name(.)='Modulus']", keyNodes[i])[0].textContent;
 			const exponent = xpath.select(".//*[local-name(.)='Exponent']", keyNodes[i])[0].textContent;
+			const modulusBuffer = Buffer.from(modulus, 'base64');
 
-			const mod = new BN(Buffer.from(modulus, 'base64'), 2).toBuffer();
+			const mod = new BN(Buffer.from(modulus, 'base64'), 2).toBuffer('be', modulusBuffer.length);
 			const exp = new BN(Buffer.from(exponent, 'base64')).toNumber();
 
 			bankKeys[`bank${type}`] = { mod, exp };