diff --git a/drivers/net/ethernet/vitesse/vtss_if_mux_dev.c b/drivers/net/ethernet/vitesse/vtss_if_mux_dev.c
index 9eaf8f3c0030..13b47aca385a 100644
--- a/drivers/net/ethernet/vitesse/vtss_if_mux_dev.c
+++ b/drivers/net/ethernet/vitesse/vtss_if_mux_dev.c
@@ -99,7 +99,7 @@ static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev) {
         goto DO_CNT;
     }
 
-    if (skb_headroom(skb) < ifh_encap_len) {
+    if (skb_cow_head(skb, ifh_encap_len)) {
         tx_ok = 0;
         pr_info("Not enough room for VTSS-header: %u\n",
                skb_headroom(skb));