diff --git a/modules/pcx86/lib/serial.js b/modules/pcx86/lib/serial.js
index 740c8f448..5a37006d3 100644
--- a/modules/pcx86/lib/serial.js
+++ b/modules/pcx86/lib/serial.js
@@ -332,7 +332,7 @@ class SerialPort extends Component {
                     if (this.connection) {
                         var exports = this.connection['exports'];
                         if (exports) {
-                            var fnConnect = exports['connect'];
+                            var fnConnect = /** @function */ (exports['connect']);
                             if (fnConnect) fnConnect.call(this.connection, this.fNullModem);
                             this.sendData = exports['receiveData'];
                             if (this.sendData) {