diff --git a/module/install/control.php b/module/install/control.php
index 69f0163f01..6a9a8fa02b 100644
--- a/module/install/control.php
+++ b/module/install/control.php
@@ -21,6 +21,7 @@ class install extends control
     {
         if(!defined('IN_INSTALL')) die();
         parent::__construct();
+        $this->config->webRoot = $this->install->getWebRoot();
     }
 
     /**
diff --git a/module/install/model.php b/module/install/model.php
index 5437503727..2399566551 100644
--- a/module/install/model.php
+++ b/module/install/model.php
@@ -144,7 +144,7 @@ class installModel extends model
      */
     public function getWebRoot()
     {
-        return rtrim(str_replace('\\', '/', pathinfo($_SERVER['SCRIPT_NAME'], PATHINFO_DIRNAME)), '/') . '/';
+        return rtrim(str_replace('\\', '/', pathinfo($_SERVER['PHP_SELF'], PATHINFO_DIRNAME)), '/') . '/';
     }
 
     /**