diff --git a/thirdparty/tcpdf/config/tcpdf_config.php b/thirdparty/tcpdf/config/tcpdf_config.php
index 3ac523e06..29d1aee61 100644
--- a/thirdparty/tcpdf/config/tcpdf_config.php
+++ b/thirdparty/tcpdf/config/tcpdf_config.php
@@ -40,47 +40,21 @@
 
 if (!defined('K_TCPDF_EXTERNAL_CONFIG')) {
 
-	// DOCUMENT_ROOT fix for IIS Webserver
-	if ((!isset($_SERVER['DOCUMENT_ROOT'])) OR (empty($_SERVER['DOCUMENT_ROOT']))) {
-		if(isset($_SERVER['SCRIPT_FILENAME'])) {
-			$_SERVER['DOCUMENT_ROOT'] = str_replace( '\\', '/', substr($_SERVER['SCRIPT_FILENAME'], 0, 0-strlen($_SERVER['PHP_SELF'])));
-		} elseif(isset($_SERVER['PATH_TRANSLATED'])) {
-			$_SERVER['DOCUMENT_ROOT'] = str_replace( '\\', '/', substr(str_replace('\\\\', '\\', $_SERVER['PATH_TRANSLATED']), 0, 0-strlen($_SERVER['PHP_SELF'])));
-		} else {
-			// define here your DOCUMENT_ROOT path if the previous fails (e.g. '/var/www')
-			$_SERVER['DOCUMENT_ROOT'] = '/';
-		}
-	}
-
-	// Automatic calculation for the following K_PATH_MAIN constant
-	$k_path_main = str_replace( '\\', '/', realpath(substr(dirname(__FILE__), 0, 0-strlen('config'))));
-	if (substr($k_path_main, -1) != '/') {
-		$k_path_main .= '/';
-	}
+	/**
+	 * Path of tcpdf library.
+	 */
+	define ('K_PATH_MAIN', PATH_THIRDPARTY . 'tcpdf' . PATH_SEP);
 
 	/**
-	 * Installation path (/var/www/tcpdf/).
-	 * By default it is automatically calculated but you can also set it as a fixed string to improve performances.
+	 * Build the URL
 	 */
-	define ('K_PATH_MAIN', $k_path_main);
-
-	// Automatic calculation for the following K_PATH_URL constant
-	$k_path_url = $k_path_main; // default value for console mode
-	if (isset($_SERVER['HTTP_HOST']) AND (!empty($_SERVER['HTTP_HOST']))) {
-		if(isset($_SERVER['HTTPS']) AND (!empty($_SERVER['HTTPS'])) AND strtolower($_SERVER['HTTPS'])!='off') {
-			$k_path_url = 'https://';
-		} else {
-			$k_path_url = 'http://';
-		}
-		$k_path_url .= $_SERVER['HTTP_HOST'];
-		$k_path_url .= str_replace( '\\', '/', substr(K_PATH_MAIN, (strlen($_SERVER['DOCUMENT_ROOT']) - 1)));
-	}
+	$protocol = G::is_https() ? "https://" : "http://";
+	$host = $_SERVER["SERVER_NAME"] . ($_SERVER["SERVER_PORT"] != "80" ? ":" . $_SERVER["SERVER_PORT"] : "");
 
 	/**
 	 * URL path to tcpdf installation folder (http://localhost/tcpdf/).
-	 * By default it is automatically calculated but you can also set it as a fixed string to improve performances.
 	 */
-	define ('K_PATH_URL', $k_path_url);
+	define ('K_PATH_URL', $protocol . $host . "/tcpdf/");
 
 	/**
 	 * path for PDF fonts