diff --git a/lib/client.js b/lib/client.js
index 724be1d..7b9bd9b 100644
--- a/lib/client.js
+++ b/lib/client.js
@@ -97,7 +97,7 @@ function TidalAPI(authData) {
 * Try login using credentials.
 * @param {{username: String, password: String}}
 */
-function tryLogin(authInfo, cb) {
+TidalApi.prototype.tryLogin = function (authInfo, cb) {
   /**
     * Logging?
     * @type {boolean}