diff --git a/openbsc/src/nat/bsc_mgcp_utils.c b/openbsc/src/nat/bsc_mgcp_utils.c
index a273af4..6a86933 100644
--- a/openbsc/src/nat/bsc_mgcp_utils.c
+++ b/openbsc/src/nat/bsc_mgcp_utils.c
@@ -458,6 +458,7 @@
 	nat->mgcp_cfg->data = nat;
 	nat->mgcp_cfg->policy_cb = bsc_mgcp_policy_cb;
 	nat->mgcp_cfg->force_realloc = 1;
+	nat->mgcp_cfg->bts_ip = "";
 	nat->bsc_endpoints = talloc_zero_array(nat,
 					       struct bsc_endpoint,
 					       nat->mgcp_cfg->number_endpoints + 1);