diff --git a/htdocs/filefunc.inc.php b/htdocs/filefunc.inc.php
index ba260ea4f19..462b1efa950 100755
--- a/htdocs/filefunc.inc.php
+++ b/htdocs/filefunc.inc.php
@@ -173,7 +173,7 @@ if (! $found)	// If autodetect fails (Ie: when using apache alias that point out
 {
 	$tmp=$dolibarr_main_url_root;
 }
-else $tmp='http'.((empty($_SERVER["HTTPS"]) || $_SERVER["HTTPS"] != 'on')?'':'s').'://'.$_SERVER["SERVER_NAME"].((empty($_SERVER["SERVER_PORT"])||$_SERVER["SERVER_PORT"]==80)?'':':'.$_SERVER["SERVER_PORT"]).($tmp3?(preg_match('/^\//',$tmp3)?'':'/').$tmp3:'');
+else $tmp='http'.(((empty($_SERVER["HTTPS"]) || $_SERVER["HTTPS"] != 'on') && (empty($_SERVER["SERVER_PORT"])||$_SERVER["SERVER_PORT"]!=443))?'':'s').'://'.$_SERVER["SERVER_NAME"].((empty($_SERVER["SERVER_PORT"])||$_SERVER["SERVER_PORT"]==80||$_SERVER["SERVER_PORT"]==443)?'':':'.$_SERVER["SERVER_PORT"]).($tmp3?(preg_match('/^\//',$tmp3)?'':'/').$tmp3:'');
 //print "tmp1=".$tmp1." tmp2=".$tmp2." tmp3=".$tmp3." tmp=".$tmp;
 
 if (! empty($dolibarr_main_force_https)) $tmp=preg_replace('/^http:/i','https:',$tmp);