diff --git a/htdocs/core/modules/commande/doc/pdf_proforma.modules.php b/htdocs/core/modules/commande/doc/pdf_proforma.modules.php
index fa555db2ced..954252f8013 100644
--- a/htdocs/core/modules/commande/doc/pdf_proforma.modules.php
+++ b/htdocs/core/modules/commande/doc/pdf_proforma.modules.php
@@ -66,14 +66,15 @@ class pdf_proforma extends pdf_eratosthene
 	 *  @param  Commande	$object     	Object to show
 	 *  @param  int	    	$showaddress    0=no, 1=yes
 	 *  @param  Translate	$outputlangs	Object lang for output
+	 *  @param  Translate	$outputlangsbis	Object lang for output bis
 	 *  @param	string		$titlekey		Translation key to show as title of document
 	 *  @return	int                         Return topshift value
 	 */
-	protected function _pagehead(&$pdf, $object, $showaddress, $outputlangs, $titlekey = "InvoiceProForma")
+	protected function _pagehead(&$pdf, $object, $showaddress, $outputlangs, $outputlangsbis = null, $titlekey = "InvoiceProForma")
 	{
 		// phpcs:enable
 		global $conf, $langs, $hookmanager;
 
-		return parent::_pagehead($pdf, $object, $showaddress, $outputlangs, $titlekey);
+		return parent::_pagehead($pdf, $object, $showaddress, $outputlangs, $outputlangsbis, $titlekey);
 	}
 }