diff --git a/lib/transport.js b/lib/transport.js
index a5b0156..1956277 100644
--- a/lib/transport.js
+++ b/lib/transport.js
@@ -46,7 +46,7 @@ async function sendToModem(partner, msg, modem, parentXid, part) {
                 ts: moment().format('YYYY-MM-DD HH:mm:ss'),
                 text: msgHead,
                 modem: modem.name,
-                username: modem.user || config.sender.username,
+                username: modem.username || config.sender.username,
             },
         });
     } catch (e) {