diff --git a/src/libsystemd-network/test-dhcp6-client.c b/src/libsystemd-network/test-dhcp6-client.c
index cb363b3973..42cd91e0be 100644
--- a/src/libsystemd-network/test-dhcp6-client.c
+++ b/src/libsystemd-network/test-dhcp6-client.c
@@ -449,6 +449,7 @@ static int test_advertise_option(sd_event *e) {
 
                 case SD_DHCP6_OPTION_IA_NA:
                         assert_se(optlen == 94);
+                        assert_se(optval == &msg_advertise[26]);
                         assert_se(!memcmp(optval, &msg_advertise[26], optlen));
 
                         val = htobe32(0x0ecfa37d);