diff --git a/src/netif/ethernetif.c b/src/netif/ethernetif.c
index 8e5cefcc..ccd7bd67 100644
--- a/src/netif/ethernetif.c
+++ b/src/netif/ethernetif.c
@@ -290,7 +290,7 @@ ethernetif_init(struct netif *netif)
    * The last argument should be replaced with your link speed, in units
    * of bits per second.
    */
-  NETIF_INIT_SNMP(netif, snmp_ifType_ethernet_csmacd, ???);
+  NETIF_INIT_SNMP(netif, snmp_ifType_ethernet_csmacd, LINK_SPEED_OF_YOUR_NETIF_IN_BPS);
 
   netif->state = ethernetif;
   netif->name[0] = IFNAME0;