diff --git a/monitor.c b/monitor.c
index 1be222ee18..344b196451 100644
--- a/monitor.c
+++ b/monitor.c
@@ -1796,16 +1796,6 @@ static void do_boot_set(Monitor *mon, const QDict *qdict)
     }
 }
 
-/**
- * do_system_powerdown(): Issue a machine powerdown
- */
-static int do_system_powerdown(Monitor *mon, const QDict *qdict,
-                               QObject **ret_data)
-{
-    qemu_system_powerdown_request();
-    return 0;
-}
-
 #if defined(TARGET_I386)
 static void print_pte(Monitor *mon, target_phys_addr_t addr,
                       target_phys_addr_t pte,
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 94da2a8ef2..4fcb92ccfa 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -244,10 +244,7 @@ EQMP
     {
         .name       = "system_powerdown",
         .args_type  = "",
-        .params     = "",
-        .help       = "send system power down event",
-        .user_print = monitor_user_noop,
-        .mhandler.cmd_new = do_system_powerdown,
+        .mhandler.cmd_new = qmp_marshal_input_system_powerdown,
     },
 
 SQMP