diff --git a/start.d/secondary_ip_route.sh b/start.d/secondary_ip_route.sh
index 3ea1d74..5043d5a 100644
--- a/start.d/secondary_ip_route.sh
+++ b/start.d/secondary_ip_route.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
 set -ex
 
-default_iface=$(ip route | grep default | awk '{print $5}')
+default_iface=$(ip route | grep default | head -n 1 | awk '{print $5}')
 iptables -t nat -I POSTROUTING -s "$OVPN_NET_SUBNET" -o "$default_iface" -j SNAT --to-source "$OVPN_PUBLIC_IP"
diff --git a/stop.d/secondary_ip_route.sh b/stop.d/secondary_ip_route.sh
index 8b4bae7..816a3fa 100644
--- a/stop.d/secondary_ip_route.sh
+++ b/stop.d/secondary_ip_route.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
 set -ex
 
-default_iface=$(ip route | grep default | awk '{print $5}')
+default_iface=$(ip route | grep default | head -n 1 | awk '{print $5}')
 iptables -t nat -D POSTROUTING -s "$OVPN_NET_SUBNET" -o "$default_iface" -j SNAT --to-source "$OVPN_PUBLIC_IP"