diff --git a/openbsc/tests/gbproxy/gbproxy_test.c b/openbsc/tests/gbproxy/gbproxy_test.c
index c458733..e93c354 100644
--- a/openbsc/tests/gbproxy/gbproxy_test.c
+++ b/openbsc/tests/gbproxy/gbproxy_test.c
@@ -810,6 +810,8 @@
 	bssgp_nsi = nsi;
 	gbcfg.nsi = bssgp_nsi;
 	gbcfg.nsip_sgsn_nsei = SGSN_NSEI;
+	gbcfg.core_mcc = 123;
+	gbcfg.core_mnc = 456;
 
 	configure_sgsn_peer(&sgsn_peer);
 	configure_bss_peers(bss_peer, ARRAY_SIZE(bss_peer));