diff --git a/script/ethercatctl.in b/script/ethercatctl.in
index 1664a31f..337d0da0 100755
--- a/script/ethercatctl.in
+++ b/script/ethercatctl.in
@@ -4,9 +4,7 @@
 #
 #  Start script for EtherCAT to use with systemd
 #
-#  $Id$
-#
-#  Copyright (C) 2006-2012  Florian Pose, Ingenieurgemeinschaft IgH
+#  Copyright (C) 2006-2021  Florian Pose, Ingenieurgemeinschaft IgH
 #
 #  This file is part of the IgH EtherCAT Master.
 #
@@ -62,13 +60,13 @@ parse_mac_address() {
     elif echo ${1} | grep -qE '^([0-9a-fA-F]{2}:){5}[0-9a-fA-F]{2}$'; then
         MAC=${1}
     else
-	DEVICENAMETOMAC=$("${IP}" address show dev "${1}" | awk '/link\/ether/ { print $2; }')
-	if echo "${DEVICENAMETOMAC}" | grep -qE '^([0-9a-fA-F]{2}:){5}[0-9a-fA-F]{2}$'; then
-	    MAC=${DEVICENAMETOMAC}
-	else
+        DEVICENAMETOMAC=$("${IP}" address show dev "${1}" | awk '/link\/ether/ { print $2; }')
+        if echo "${DEVICENAMETOMAC}" | grep -qE '^([0-9a-fA-F]{2}:){5}[0-9a-fA-F]{2}$'; then
+            MAC=${DEVICENAMETOMAC}
+        else
             echo Invalid MAC address \""${1}"\" in ${ETHERCAT_CONFIG}
             exit 1
-	fi
+        fi
     fi
 }