diff --git a/src/timesync.cpp b/src/timesync.cpp
index b44a955a..524ac10f 100644
--- a/src/timesync.cpp
+++ b/src/timesync.cpp
@@ -106,7 +106,7 @@ void process_timesync_req(void *taskparameter) {
         payload.addByte(0x99);
         SendPayload(RCMDPORT, prio_high);
         // ...send a alive open a receive window for last time_sync_answer
-        // LMIC_sendAlive();
+        LMIC_sendAlive();
       }
     } // end of for loop to collect timestamp samples