diff --git a/openbsc/src/nat/bsc_nat_utils.c b/openbsc/src/nat/bsc_nat_utils.c
index 7b75fa5..0470387 100644
--- a/openbsc/src/nat/bsc_nat_utils.c
+++ b/openbsc/src/nat/bsc_nat_utils.c
@@ -126,6 +126,7 @@
 	conf->token = talloc_strdup(conf, token);
 	conf->nr = nat->num_bsc;
 	conf->nat = nat;
+	conf->number_multiplexes = 1;
 
 	INIT_LLIST_HEAD(&conf->lac_list);