diff --git a/lib/register-modem.js b/lib/register-modem.js
index 9aa4145..01cf957 100644
--- a/lib/register-modem.js
+++ b/lib/register-modem.js
@@ -21,7 +21,7 @@ function reportUrl() {
     return `${baseUrl}/modems/set`;
 }
 
-async function sender(modemInfo) {
+function sender(modemInfo) {
     if (mutex.tryLock()) {
         // logger.info('Getting message counters before registering modem');