diff --git a/src/osmo_gsm_tester/obj/ms_android.py b/src/osmo_gsm_tester/obj/ms_android.py
index 9fddff3..0f4a05d 100644
--- a/src/osmo_gsm_tester/obj/ms_android.py
+++ b/src/osmo_gsm_tester/obj/ms_android.py
@@ -79,6 +79,7 @@
         self.remote_metrics_file = None
         self.metrics_file = None
         self.brate_mon = None
+        self.num_carriers = 1
 
     def configure(self):
         values = dict(ue=config.get_defaults('androidue'))