diff --git a/lib/modem.js b/lib/modem.js
index 5307d8d..3bbad99 100644
--- a/lib/modem.js
+++ b/lib/modem.js
@@ -2,7 +2,7 @@
 
 const INTERVAL_BEETWEN_SIGNAL_STRENGTH_MS = 60000;
 const MAX_LAST_DATA_AGE_MS = 3 * 60 * 1000;
-const REGEX_WAIT_FOR_OK_OR_ERROR = /\n(?:OK|ERROR)\r/;
+const REGEX_WAIT_FOR_OK_OR_ERROR = /[\r\n]+(?:OK|ERROR)\r/;
 
 const moment = require('moment');
 const SerialPort = require('serialport');