diff --git a/htdocs/core/modules/ticket/modules_ticket.php b/htdocs/core/modules/ticket/modules_ticket.php
index ad8394fa91e..6aa027f16fc 100644
--- a/htdocs/core/modules/ticket/modules_ticket.php
+++ b/htdocs/core/modules/ticket/modules_ticket.php
@@ -1,6 +1,7 @@
 <?php
-/* Copyright (C) 2010-2014    Regis Houssin    <regis.houssin@inodbox.com>
- * Copyright (C) 2014       Marcos García   <marcosgdf@gmail.com>
+/* Copyright (C) 2010-2014  Regis Houssin    <regis.houssin@inodbox.com>
+ * Copyright (C) 2014       Marcos García    <marcosgdf@gmail.com>
+ * Copyright (C) 2020       Charlene Benke   <charlie@patas-monkey.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -24,6 +25,38 @@
  *                  and parent class for projects numbering models
  */
 
+require_once DOL_DOCUMENT_ROOT.'/core/class/commondocgenerator.class.php';
+
+/**
+ *	Parent class for documents models
+ */
+abstract class ModelePDFTicket extends CommonDocGenerator
+{
+
+    // phpcs:disable PEAR.NamingConventions.ValidFunctionName.ScopeNotCamelCaps
+    /**
+     *  Return list of active generation modules
+     *
+     *  @param	DoliDB	$db     			Database handler
+     *  @param  integer	$maxfilenamelength  Max length of value to show
+     *  @return	array						List of templates
+	 */
+	public static function liste_modeles($db, $maxfilenamelength = 0)
+	{
+        // phpcs:enable
+		global $conf;
+
+		$type = 'ticket';
+		$list = array();
+
+		include_once DOL_DOCUMENT_ROOT.'/core/lib/functions2.lib.php';
+		$list = getListOfModels($db, $type, $maxfilenamelength);
+
+		return $list;
+	}
+}
+
+
 /**
  *  Classe mere des modeles de numerotation des references de projets
  */