diff --git a/openbsc/tests/sgsn/sgsn_test.c b/openbsc/tests/sgsn/sgsn_test.c
index 6eabdde..2f1513a 100644
--- a/openbsc/tests/sgsn/sgsn_test.c
+++ b/openbsc/tests/sgsn/sgsn_test.c
@@ -1164,6 +1164,7 @@
 {
 	struct gsm_auth_tuple at = {
 		.vec.sres = {0x51, 0xe5, 0x51, 0xe5},
+		.vec.auth_types = OSMO_AUTH_TYPE_GSM,
 		.key_seq = 0
 	};