diff --git a/mptcp/files/etc/init.d/mptcp b/mptcp/files/etc/init.d/mptcp
index 079cf3c57..a0cffc299 100755
--- a/mptcp/files/etc/init.d/mptcp
+++ b/mptcp/files/etc/init.d/mptcp
@@ -367,7 +367,7 @@ start_service() {
 	config_foreach add_route route
 	config_foreach add_route route6
 	# If no master is defined, one interface is defined as master
-	if [ "$master" = "" ]; then
+	if [ "$master" = "" ] && [ "$intf" = "" ]; then
 		intfmaster="$(echo $mptcpintf | cut -d' ' -f1 | tr -d '\n')"
 		[ "$intfmaster" != "" ] && {
 			logger -t "MPTCP" "No master multipath defined, setting it to $intfmaster"