diff --git a/lib/Client.js b/lib/Client.js
index 335fbd2..13f9b57 100644
--- a/lib/Client.js
+++ b/lib/Client.js
@@ -224,7 +224,7 @@ module.exports = class Client {
 				(err, res, data) => {
 					if (err) reject(err);
 
-					const ebicsResponse = response.version(version)(data, keys);
+					const ebicsResponse = response.version(version)(data.toString('utf-8'), keys);
 
 					if (this.tracesStorage)
 						this.tracesStorage