diff --git a/sysmocom/defaults.conf b/sysmocom/defaults.conf
index a9015f7..7704857 100644
--- a/sysmocom/defaults.conf
+++ b/sysmocom/defaults.conf
@@ -180,6 +180,7 @@
 amarisoftue:
   tx_gain: 89
   rx_gain: 60
+  rf_dev_sync: none
 
 iperf3cli:
   time: 60