diff --git a/deluge/ui/web/js/deluge-all/preferences/InstallPluginWindow.js b/deluge/ui/web/js/deluge-all/preferences/InstallPluginWindow.js
index c1d9e2b14..2fea7915e 100644
--- a/deluge/ui/web/js/deluge-all/preferences/InstallPluginWindow.js
+++ b/deluge/ui/web/js/deluge-all/preferences/InstallPluginWindow.js
@@ -74,7 +74,7 @@ Deluge.preferences.InstallPluginWindow = Ext.extend(Ext.Window, {
 
     onInstall: function(field, e) {
         this.form.getForm().submit({
-            url: '/upload',
+            url: deluge.config.base + 'upload',
             waitMsg: _('Uploading your plugin...'),
             success: this.onUploadSuccess,
             scope: this