diff --git a/index.php b/index.php
index e32996f..167c440 100755
--- a/index.php
+++ b/index.php
@@ -53,7 +53,11 @@ switch ($action) {
 }
 
 function url(){
-  $protocol = ($_SERVER['HTTPS'] && $_SERVER['HTTPS'] != "off") ? "https" : "http";
+  $protocol = "http";
+  if(isset($_SERVER['HTTPS']))
+    if($_SERVER['HTTPS'] != "off")
+      $protocol = "https";
+  
   return $protocol . "://" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
 }
 ?>