It's simple, probably more efficient, to hand-craft the dict.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 qapi/qmp-dispatch.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/qapi/qmp-dispatch.c b/qapi/qmp-dispatch.c
index 188b5680b6..fcf6cb0bf8 100644
--- a/qapi/qmp-dispatch.c
+++ b/qapi/qmp-dispatch.c
@@ -50,10 +50,10 @@ void qmp_return(QmpReturn *qret, QObject *rsp)
 
 void qmp_return_error(QmpReturn *qret, Error *err)
 {
-    qdict_put_obj(qret->rsp, "error",
-                  qobject_from_jsonf_nofail("{ 'class': %s, 'desc': %s }",
-                      QapiErrorClass_str(error_get_class(err)),
-                      error_get_pretty(err)));
+    QDict *qdict = qdict_new();
+    qdict_put_str(qdict, "class", QapiErrorClass_str(error_get_class(err)));
+    qdict_put_str(qdict, "desc", error_get_pretty(err));
+    qdict_put_obj(qret->rsp, "error", QOBJECT(qdict));
     error_free(err);
     qret->session->return_cb(qret->session, qret->rsp);
     qmp_return_free(qret);
-- 
2.24.0