diff --git a/target/linux/ar71xx/files/arch/mips/ath79/mach-tl-wr940n-v4.c b/target/linux/ar71xx/files/arch/mips/ath79/mach-tl-wr940n-v4.c
index b530622d9f..9324b2b924 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/mach-tl-wr940n-v4.c
+++ b/target/linux/ar71xx/files/arch/mips/ath79/mach-tl-wr940n-v4.c
@@ -143,7 +143,7 @@ static void __init tl_wr940n_setup(void)
 	ath79_register_mdio(0, 0x0);
 
 	ath79_init_mac(ath79_eth0_data.mac_addr, mac, 1);
-	ath79_init_mac(ath79_eth1_data.mac_addr, mac, -1);
+	ath79_init_mac(ath79_eth1_data.mac_addr, mac, 0);
 
 	ath79_switch_data.phy4_mii_en = 1;