diff --git a/web/index.php b/web/index.php
index fae6d5e21..4a37241a7 100644
--- a/web/index.php
+++ b/web/index.php
@@ -51,9 +51,12 @@ require_once( 'includes/Event.php' );
 require_once( 'includes/Group.php' );
 require_once( 'includes/Monitor.php' );
 
-if ($_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') $_SERVER['HTTPS']='on';
 
-if ( isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on' ) {
+if (
+  (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on')
+  or
+  ($_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https')
+) {
   $protocol = 'https';
 } else {
   $protocol = 'http';