diff --git a/hw/rtl8139.c b/hw/rtl8139.c
index 72e2242..ee4fc5d 100644
--- a/hw/rtl8139.c
+++ b/hw/rtl8139.c
@@ -3382,7 +3382,7 @@ static int pci_rtl8139_init(PCIDevice *dev)
 
     s->nic = qemu_new_nic(&net_rtl8139_info, &s->conf,
                           dev->qdev.info->name, dev->qdev.id, s);
-    qemu_format_nic_info_str(&s->nic->nc, s->conf.macaddr.a);
+    qemu_format_nic_info_dict(&s->nic->nc, s->conf.macaddr.a);
 
     s->cplus_txbuffer = NULL;
     s->cplus_txbuffer_len = 0;