diff --git a/functions-common b/functions-common
index 4739e42..ed43e20 100644
--- a/functions-common
+++ b/functions-common
@@ -542,11 +542,11 @@
     local host_ip_iface=$3
     local host_ip=$4
 
-    # Find the interface used for the default route
-    host_ip_iface=${host_ip_iface:-$(ip route | sed -n '/^default/{ s/.*dev \(\w\+\)\s\+.*/\1/; p; }' | head -1)}
     # Search for an IP unless an explicit is set by ``HOST_IP`` environment variable
     if [ -z "$host_ip" -o "$host_ip" == "dhcp" ]; then
         host_ip=""
+        # Find the interface used for the default route
+        host_ip_iface=${host_ip_iface:-$(ip route | awk '/default/ {print $5}' | head -1)}
         local host_ips=$(LC_ALL=C ip -f inet addr show ${host_ip_iface} | awk '/inet/ {split($2,parts,"/");  print parts[1]}')
         local ip
         for ip in $host_ips; do