diff --git a/htdocs/core/modules/expensereport/doc/pdf_standard.modules.php b/htdocs/core/modules/expensereport/doc/pdf_standard.modules.php
index 176b09264d4..8495aba945d 100644
--- a/htdocs/core/modules/expensereport/doc/pdf_standard.modules.php
+++ b/htdocs/core/modules/expensereport/doc/pdf_standard.modules.php
@@ -59,6 +59,11 @@ class pdf_standard extends ModeleExpenseReport
 	 */
 	public $description;
 
+	/**
+	 * @var int     Save the name of generated file as the main doc when generating a doc with this template
+	 */
+	public $update_main_doc_field;
+
 	/**
 	 * @var string document type
 	 */
@@ -133,6 +138,7 @@ class pdf_standard extends ModeleExpenseReport
 		$this->db = $db;
 		$this->name = "";
 		$this->description = $langs->trans('PDFStandardExpenseReports');
+		$this->update_main_doc_field = 1; // Save the name of generated file as the main doc when generating a doc with this template
 
 		// Page size for A4 format
 		$this->type = 'pdf';