diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 874722def2e..d59d186f5b2 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -740,7 +740,10 @@ function dol_syslog($message, $level = LOG_INFO, $ident = 0, $suffixinfilename='
     		'ip' => false
     	);
 
-    	if (! empty($_SERVER["REMOTE_ADDR"])) $data['ip'] = $_SERVER['REMOTE_ADDR'];
+    	// This is when server run behind a reverse proxy
+    	if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) $data['ip'] = $_SERVER['HTTP_X_FORWARDED_FOR'].(empty($_SERVER["REMOTE_ADDR"])?'':'->'.$_SERVER['REMOTE_ADDR']);
+    	// This is when server run normally on a server
+    	else if (! empty($_SERVER["REMOTE_ADDR"])) $data['ip'] = $_SERVER['REMOTE_ADDR'];
     	// This is when PHP session is ran inside a web server but not inside a client request (example: init code of apache)
     	else if (! empty($_SERVER['SERVER_ADDR'])) $data['ip'] = $_SERVER['SERVER_ADDR'];
     	// This is when PHP session is ran outside a web server, like from Windows command line (Not always defined, but useful if OS defined it).