diff --git a/example/defaults.conf b/example/defaults.conf
index eee17b1..3de5e29 100644
--- a/example/defaults.conf
+++ b/example/defaults.conf
@@ -84,3 +84,6 @@
   type: uhd
   launch_trx: true
   clock_reference: internal
+
+osmo_bts_virtual:
+  max_trx: 1