diff --git a/src/machine/machined-dbus.c b/src/machine/machined-dbus.c
index 6fe1206d64..da64095d37 100644
--- a/src/machine/machined-dbus.c
+++ b/src/machine/machined-dbus.c
@@ -390,7 +390,7 @@ static int method_register_machine_internal(sd_bus_message *message, bool read_n
         if (r < 0)
                 return r;
 
-        r = cg_pid_get_unit(m->leader.pid, &m->unit);
+        r = cg_pidref_get_unit(&m->leader, &m->unit);
         if (r < 0) {
                 r = sd_bus_error_set_errnof(error, r,
                                             "Failed to determine unit of process "PID_FMT" : %m",