diff --git a/www/manager6/dc/OptionView.js b/www/manager6/dc/OptionView.js
index 4717277f..b200fd12 100644
--- a/www/manager6/dc/OptionView.js
+++ b/www/manager6/dc/OptionView.js
@@ -94,7 +94,7 @@ Ext.define('PVE.dc.OptionView', {
 	me.add_text_row('mac_prefix', gettext('MAC address prefix'), {
 	    deleteEmpty: true,
 	    vtype: 'MacPrefix',
-	    defaultValue: Proxmox.Utils.noneText,
+	    defaultValue: 'BC:24:11',
 	});
 	me.add_inputpanel_row('migration', gettext('Migration Settings'), {
 	    renderer: PVE.Utils.render_as_property_string,