diff --git a/common.php b/common.php
index 0f6c0f71c..86254493f 100644
--- a/common.php
+++ b/common.php
@@ -19,10 +19,9 @@ header('X-Frame-Options: SAMEORIGIN');
 // Get initial config
 require(BB_ROOT . 'library/config.php');
 
-$server_protocol = ($bb_cfg['cookie_secure']) ? 'https://' : 'http://';
-$server_port = ($bb_cfg['server_port'] != 80) ? ':'. $bb_cfg['server_port'] : '';
+$server_protocol = '//';
 define('FORUM_PATH', $bb_cfg['script_path']);
-define('FULL_URL', $server_protocol . $bb_cfg['server_name'] . $server_port . $bb_cfg['script_path']);
+define('FULL_URL', $server_protocol . $bb_cfg['server_name'] . $bb_cfg['script_path']);
 unset($server_protocol, $server_port);
 
 // Debug options