diff --git a/openbsc/tests/mm_auth/mm_auth_test.c b/openbsc/tests/mm_auth/mm_auth_test.c
index c0b8da4..e541898 100644
--- a/openbsc/tests/mm_auth/mm_auth_test.c
+++ b/openbsc/tests/mm_auth/mm_auth_test.c
@@ -242,6 +242,36 @@
 		));
 }
 
+static void test_auth_reuse()
+{
+	int auth_action;
+	struct gsm_auth_tuple atuple = {0};
+	struct gsm_subscriber subscr = {0};
+	int key_seq;
+
+	printf("\n* test_auth_reuse()\n");
+
+	/* Ki entry, auth tuple negotiated, valid+matching incoming key_seq */
+	test_auth_info = default_auth_info;
+	test_last_auth_tuple = default_auth_tuple;
+	test_last_auth_tuple.key_seq = key_seq = 3;
+	test_last_auth_tuple.use_count = 1;
+	test_get_authinfo_rc = 0;
+	test_get_lastauthtuple_rc = 0;
+	auth_action = auth_get_tuple_for_subscr_verbose(&atuple, &subscr,
+							key_seq);
+	OSMO_ASSERT(auth_action == AUTH_DO_CIPH);
+	OSMO_ASSERT(auth_tuple_is(&atuple,
+		"gsm_auth_tuple {\n"
+		"  .use_count = 2\n"
+		"  .key_seq = 3\n"
+		"  .rand = 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 \n"
+		"  .sres = 00 00 00 00 \n"
+		"  .kc = 00 00 00 00 00 00 00 00 \n"
+		"}\n"
+		));
+}
+
 int main(void)
 {
 	osmo_init_logging(&log_info);
@@ -251,5 +281,6 @@
 	test_auth_not_avail();
 	test_auth_then_ciph1();
 	test_auth_then_ciph2();
+	test_auth_reuse();
 	return 0;
 }
diff --git a/openbsc/tests/mm_auth/mm_auth_test.ok b/openbsc/tests/mm_auth/mm_auth_test.ok
index 52feb36..cc0e769 100644
--- a/openbsc/tests/mm_auth/mm_auth_test.ok
+++ b/openbsc/tests/mm_auth/mm_auth_test.ok
@@ -22,3 +22,9 @@
 wrapped: db_get_lastauthtuple_for_subscr(): rc = 0
 wrapped: db_sync_lastauthtuple_for_subscr(): rc = 0
 auth_get_tuple_for_subscr(key_seq=7) --> auth_action == AUTH_DO_AUTH_THEN_CIPH
+
+* test_auth_reuse()
+wrapped: db_get_authinfo_for_subscr(): rc = 0
+wrapped: db_get_lastauthtuple_for_subscr(): rc = 0
+wrapped: db_sync_lastauthtuple_for_subscr(): rc = 0
+auth_get_tuple_for_subscr(key_seq=3) --> auth_action == AUTH_DO_CIPH