diff --git a/target/linux/brcm63xx/base-files/lib/preinit/05_failsafe_config_switch_brcm63xx b/target/linux/brcm63xx/base-files/lib/preinit/05_failsafe_config_switch_brcm63xx
index b9be96eda..43da8cc06 100644
--- a/target/linux/brcm63xx/base-files/lib/preinit/05_failsafe_config_switch_brcm63xx
+++ b/target/linux/brcm63xx/base-files/lib/preinit/05_failsafe_config_switch_brcm63xx
@@ -1,9 +1,9 @@
 #!/bin/sh
 
 failsafe_ip() {
-	[ -d /proc/switch/eth1 ] && [ "$ifname" = "eth1" ] && {
-		ifconfig eth1 0.0.0.0 down
-		echo "0 1 2 3 4 ${cpu_port:-5u*}" > /proc/switch/eth1/vlan/0/ports
+	[ -d "/proc/switch/$ifname" ] && {
+		ifconfig "$ifname" 0.0.0.0 down
+		echo "0 1 2 3 4 ${cpu_port:-5u*}" > "/proc/switch/$ifname/vlan/0/ports"
 	}
 	
 	[ -n "$pi_ifname" ] && grep -q "$pi_ifname" /proc/net/dev && {
diff --git a/target/linux/brcm63xx/base-files/lib/preinit/15_set_preinit_interface_brcm63xx b/target/linux/brcm63xx/base-files/lib/preinit/15_set_preinit_interface_brcm63xx
index 6c7a8a858..9d366fa33 100644
--- a/target/linux/brcm63xx/base-files/lib/preinit/15_set_preinit_interface_brcm63xx
+++ b/target/linux/brcm63xx/base-files/lib/preinit/15_set_preinit_interface_brcm63xx
@@ -16,9 +16,9 @@ preinit_ip_deconfig() {
 			ifconfig $pi_ifname 0.0.0.0 down
 		}
 	fi
-	[ -d /proc/switch/eth1 ] && [ "$ifname" = "eth1" ] && {
-		echo 1 >/proc/switch/eth1/reset
-		echo "0 1 2 3 4 ${cpu_port:-5u*}" > /proc/switch/eth1/vlan/0/ports
+	[ -d "/proc/switch/$ifname" ] && {
+		echo 1 > "/proc/switch/$ifname/reset"
+		echo "0 1 2 3 4 ${cpu_port:-5u*}" > "/proc/switch/$ifname/vlan/0/ports"
 	}
 
 }
@@ -26,17 +26,17 @@ preinit_ip_deconfig() {
 preinit_net_echo() {
 	preinit_ip
 	
-	[ -d /proc/switch/eth1 ] && [ "$ifname" = "eth1" ] && {
-		echo 1 >/proc/switch/eth1/reset
+	[ -d "/proc/switch/$ifname" ] && {
+		echo 1 > "/proc/switch/$ifname/reset"
 
 		# this would be easier if we blasted the message across all ports
 		# but we don't want packets leaking across interfaces
 		for port in $(seq 0 4); do {
-			echo "$port ${cpu_port:-5u*}" > /proc/switch/eth1/vlan/0/ports
+			echo "$port ${cpu_port:-5u*}" > "/proc/switch/$ifname/vlan/0/ports"
 			port_net_echo $1
 		}; done
 		
-		echo "0 ${cpu_port:-5u*}" > /proc/switch/eth1/vlan/0/ports
+		echo "0 ${cpu_port:-5u*}" > "/proc/switch/$ifname/vlan/0/ports"
 		
 	} || port_net_echo $1
 }