diff --git a/drivers/net/caif/caif_serial.c b/drivers/net/caif/caif_serial.c
index bcc14c5875bf0..4cc0d91d9c871 100644
--- a/drivers/net/caif/caif_serial.c
+++ b/drivers/net/caif/caif_serial.c
@@ -270,9 +270,7 @@ static netdev_tx_t caif_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	struct ser_device *ser;
 
-	if (WARN_ON(!dev))
-		return -EINVAL;
-
+	BUG_ON(dev == NULL);
 	ser = netdev_priv(dev);
 
 	/* Send flow off once, on high water mark */