diff --git a/monitor.c b/monitor.c
index 598dbfe5f2..0ae408aafa 100644
--- a/monitor.c
+++ b/monitor.c
@@ -1006,7 +1006,7 @@ static int do_eject(Monitor *mon, const QDict *qdict, QObject **ret_data)
     return eject_device(mon, bs, force);
 }
 
-static void do_block_set_passwd(Monitor *mon, const QDict *qdict,
+static int do_block_set_passwd(Monitor *mon, const QDict *qdict,
                                 QObject **ret_data)
 {
     BlockDriverState *bs;
@@ -1014,12 +1014,15 @@ static void do_block_set_passwd(Monitor *mon, const QDict *qdict,
     bs = bdrv_find(qdict_get_str(qdict, "device"));
     if (!bs) {
         qemu_error_new(QERR_DEVICE_NOT_FOUND, qdict_get_str(qdict, "device"));
-        return;
+        return -1;
     }
 
     if (bdrv_set_key(bs, qdict_get_str(qdict, "password")) < 0) {
         qemu_error_new(QERR_INVALID_PASSWORD);
+        return -1;
     }
+
+    return 0;
 }
 
 static void do_change_block(Monitor *mon, const char *device,
diff --git a/qemu-monitor.hx b/qemu-monitor.hx
index 835fd05730..d2be5c416a 100644
--- a/qemu-monitor.hx
+++ b/qemu-monitor.hx
@@ -1117,7 +1117,7 @@ ETEXI
         .params     = "block_passwd device password",
         .help       = "set the password of encrypted block devices",
         .user_print = monitor_user_noop,
-        .mhandler.cmd_new = do_block_set_passwd,
+        .cmd_new_ret = do_block_set_passwd,
     },
 
 STEXI