diff --git a/hw/net/rtl8139.c b/hw/net/rtl8139.c
index 9b4a6501d7..3225f3d3e5 100644
--- a/hw/net/rtl8139.c
+++ b/hw/net/rtl8139.c
@@ -2741,9 +2741,13 @@ static void rtl8139_io_writeb(void *opaque, uint8_t addr, uint32_t val)
 
     switch (addr)
     {
-        case MAC0 ... MAC0+5:
+        case MAC0 ... MAC0+4:
             s->phys[addr - MAC0] = val;
             break;
+        case MAC0+5:
+            s->phys[addr - MAC0] = val;
+            qemu_format_nic_info_str(qemu_get_queue(s->nic), s->phys);
+            break;
         case MAC0+6 ... MAC0+7:
             /* reserved */
             break;