diff --git a/deluge/ui/web/js/deluge-all/preferences/NetworkPage.js b/deluge/ui/web/js/deluge-all/preferences/NetworkPage.js
index 1d4774e73..fad66aaae 100644
--- a/deluge/ui/web/js/deluge-all/preferences/NetworkPage.js
+++ b/deluge/ui/web/js/deluge-all/preferences/NetworkPage.js
@@ -32,7 +32,7 @@
 Ext.namespace('Deluge.preferences');
 
 // custom Vtype for vtype:'IPAddress'
-Ext.apply(Ext.form.field.VTypes, {
+Ext.apply(Ext.form.VTypes, {
     IPAddress:  function(v) {
         return /^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/.test(v);
     },