diff --git a/target/linux/ar71xx/files/arch/mips/ath79/mach-sysmocom.c b/target/linux/ar71xx/files/arch/mips/ath79/mach-sysmocom.c
index eb129da..195054c 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/mach-sysmocom.c
+++ b/target/linux/ar71xx/files/arch/mips/ath79/mach-sysmocom.c
@@ -82,7 +82,8 @@ static void __init sysmocom_sob_ap1_setup(void)
 	ath79_setup_ar933x_phy4_switch(false, false);
 	ath79_init_mac(ath79_eth0_data.mac_addr, art + SYSMOCOM_MAC0_OFFSET, 0);
 	ath79_register_mdio(0, 0x0);
-	ath79_register_eth(0);
+	/* ath79_register_eth(0) is unused because it using the internal switch */
+	ath79_register_eth(1);
 
 	ath79_gpio_function_disable(AR724X_GPIO_FUNC_ETH_SWITCH_LED0_EN |
 				AR724X_GPIO_FUNC_ETH_SWITCH_LED1_EN |
@@ -139,7 +140,8 @@ static void __init sysmocom_sob_jb02_setup(void)
 	ath79_setup_ar933x_phy4_switch(false, false);
 	ath79_init_mac(ath79_eth0_data.mac_addr, art + SYSMOCOM_MAC0_OFFSET, 0);
 	ath79_register_mdio(0, 0x0);
-	ath79_register_eth(0);
+	/* ath79_register_eth(0) is unused because it using the internal switch */
+	ath79_register_eth(1);
 
 	ath79_gpio_function_disable(AR724X_GPIO_FUNC_ETH_SWITCH_LED0_EN |
 				AR724X_GPIO_FUNC_ETH_SWITCH_LED1_EN |