diff --git a/sysmocom/defaults.conf b/sysmocom/defaults.conf
index 419c3a4..8201d05 100644
--- a/sysmocom/defaults.conf
+++ b/sysmocom/defaults.conf
@@ -110,6 +110,7 @@
   id: 0x19B
   mcc: 901
   mnc: 70
+  duplex: fdd
   transmission_mode: 1
   num_cells: 1
   inactivity_timer: 20000