diff --git a/monitor.c b/monitor.c
index ef33cf4402..ff22123693 100644
--- a/monitor.c
+++ b/monitor.c
@@ -907,7 +907,7 @@ static void do_cpu_set(Monitor *mon, const QDict *qdict, QObject **ret_data)
 {
     int index = qdict_get_int(qdict, "index");
     if (mon_set_cpu(index) < 0)
-        qemu_error_new(QERR_INVALID_CPU_INDEX);
+        qemu_error_new(QERR_INVALID_PARAMETER, "index");
 }
 
 static void do_info_jit(Monitor *mon)