diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 3b3e1f6632d71c1aae24d690679b4b53673ce148..349c2e967bd1ca894fc1a87f8eddfd96340403f9 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -2665,7 +2665,7 @@ static inline void muxnet_put(struct gsm_mux_net *mux_net)
 	kref_put(&mux_net->ref, net_free);
 }
 
-static int gsm_mux_net_start_xmit(struct sk_buff *skb,
+static netdev_tx_t gsm_mux_net_start_xmit(struct sk_buff *skb,
 				      struct net_device *net)
 {
 	struct gsm_mux_net *mux_net = netdev_priv(net);