diff --git a/html/install.php b/html/install.php
index 60107d1c3a..02dbc8eb74 100644
--- a/html/install.php
+++ b/html/install.php
@@ -32,9 +32,11 @@ $config['db_name']=$dbname;
 include("../includes/defaults.inc.php");
 // Work out the install directory
 $cur_dir = explode('/',$_SERVER['DOCUMENT_ROOT']);
-if( empty(end($cur_dir)) ) {
+$check = end($cur_dir);
+if( empty($check) ) {
   $install_dir = array_pop($cur_dir);
 }
+unset($check);
 $install_dir = array_pop($cur_dir);
 $install_dir = implode('/',$cur_dir);
 $config['install_dir'] = $install_dir;