diff --git a/src/osmo_gsm_tester/obj/ms_srs.py b/src/osmo_gsm_tester/obj/ms_srs.py
index 1cc17dfb..54dc5de6 100644
--- a/src/osmo_gsm_tester/obj/ms_srs.py
+++ b/src/osmo_gsm_tester/obj/ms_srs.py
@@ -53,7 +53,8 @@ def on_register_schemas():
     config_schema = {
         'enable_pcap': schema.BOOL_STR,
         'log_all_level': schema.STR,
-        'log_nas_level': schema.STR
+        'log_nas_level': schema.STR,
+        'nr_short_sn_support': schema.BOOL_STR
         }
     schema.register_config_schema('modem', config_schema)
 
diff --git a/sysmocom/defaults.conf b/sysmocom/defaults.conf
index 8bbae422..8740d626 100644
--- a/sysmocom/defaults.conf
+++ b/sysmocom/defaults.conf
@@ -187,6 +187,7 @@ srsue:
   log_all_level: warning
   log_nas_level: warning
   force_ul_amplitude: 0
+  nr_short_sn_support: true
 
 amarisoftue:
   tx_gain: 89