diff --git a/mptcp/files/etc/init.d/mptcp b/mptcp/files/etc/init.d/mptcp
index 360d757cbb..8afcebff91 100755
--- a/mptcp/files/etc/init.d/mptcp
+++ b/mptcp/files/etc/init.d/mptcp
@@ -250,7 +250,7 @@ interface_multipath_settings() {
 		network_get_subnet netmask $config
 		[ -n "$netmask" ] && [ "$(echo $netmask | grep '/')" != "" ] && netmask=""
 		[ -z "$netmask" ] && netmask=$(ip -4 addr show dev $iface | grep peer | awk '{print $4}' | cut -d/ -f2 | tr -d "\n")
-		[ -z "$netmask" ] && netmask=$(ip -4 addr show dev $iface | grep inet | awk '{print $2}' | cut -d/ -f2 | tr -d "\n")
+		[ -z "$netmask" ] && netmask=$(ip -4 addr show dev $iface | grep 'inet ' | awk '{print $2}' | cut -d/ -f2 | tr -d "\n")
 		[ -n "$ipaddr" ] && ipaddr=$(echo $ipaddr | cut -d/ -f1 | tr -d "\n")
 		[ -n "$ipaddr" ] && [ -n "$netmask" ] && netmask=`ipcalc.sh $ipaddr/$netmask | sed -n '/PREFIX=/{;s/.*=//;s/ .*//;p;}'`
 		[ -n "$ipaddr" ] && [ -n "$netmask" ] && network=`ipcalc.sh $ipaddr/$netmask | sed -n '/NETWORK=/{;s/.*=//;s/ .*//;p;}'`