/* Initialize other registers. */
__set_mac_addr(dev);
-#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
+#if IS_ENABLED(CONFIG_VLAN_8021Q)
iowrite16(dev->mtu + 18, ioaddr + MaxFrameSize);
#else
iowrite16(dev->mtu + 14, ioaddr + MaxFrameSize);