diff --git a/modem-tester.js b/modem-tester.js
index cbe5828..5732599 100644
--- a/modem-tester.js
+++ b/modem-tester.js
@@ -80,6 +80,7 @@ port = new SerialPort(config.modem.device, { baudRate: 115200 }, async (err) =>
 });
 
 parsers.setPort(port);
+modemCommands.setPort(port);
 
 if (config && config.modem_tester && config.modem_tester.parser === 'regex') {
     logger.info('Using parserWaitForOkOrError');