diff --git a/minissdpd/testminissdpd.sh b/minissdpd/testminissdpd.sh
index 94f6328..53d27e1 100755
--- a/minissdpd/testminissdpd.sh
+++ b/minissdpd/testminissdpd.sh
@@ -1,12 +1,16 @@
 #!/bin/sh
 # $Id: testminissdpd.sh,v 1.2 2015/09/03 18:31:25 nanard Exp $
-# (c) 2015 Thomas Bernard
+# (c) 2016 Thomas Bernard
 
 OS=`uname -s`
 IF=lo
 if [ "$OS" = "Darwin" ] ; then
 	IF=lo0
 fi
+# if set, 1st argument is network interface
+if [ -n "$1" ] ; then
+	IF=$1
+fi
 SOCKET=`mktemp -t minissdpdsocketXXXXXX`
 PID="${SOCKET}.pid"
 ./minissdpd -s $SOCKET -p $PID -i $IF  || exit 1