diff --git a/hw/net/xen_nic.c b/hw/net/xen_nic.c
index 5c815b4..7d92c2d 100644
--- a/hw/net/xen_nic.c
+++ b/hw/net/xen_nic.c
@@ -296,9 +296,8 @@
     netdev->nic = qemu_new_nic(&net_xen_info, &netdev->conf,
                                "xen", NULL, netdev);
 
-    snprintf(qemu_get_queue(netdev->nic)->info_str,
-             sizeof(qemu_get_queue(netdev->nic)->info_str),
-             "nic: xenbus vif macaddr=%s", netdev->mac);
+    qemu_set_info_str(qemu_get_queue(netdev->nic),
+                      "nic: xenbus vif macaddr=%s", netdev->mac);
 
     /* fill info */
     xenstore_write_be_int(&netdev->xendev, "feature-rx-copy", 1);