diff --git a/bacnet-stack/demo/handler/s_ts.c b/bacnet-stack/demo/handler/s_ts.c
index 96ca70e0..a15f7726 100644
--- a/bacnet-stack/demo/handler/s_ts.c
+++ b/bacnet-stack/demo/handler/s_ts.c
@@ -91,6 +91,10 @@ void Send_TimeSyncUTC(
 
     /* we could use unicast or broadcast */
     datalink_get_broadcast_address(&dest);
+    /* encode the NPDU portion of the packet */
+    npdu_encode_npdu_data(&npdu_data, false, MESSAGE_PRIORITY_NORMAL);
+    pdu_len =
+        npdu_encode_pdu(&Handler_Transmit_Buffer[0], &dest, NULL, &npdu_data);
     /* encode the APDU portion of the packet */
     pdu_len =
         timesync_utc_encode_apdu(&Handler_Transmit_Buffer[0], bdate, btime);