diff --git a/htdocs/core/modules/mailings/advthirdparties.modules.php b/htdocs/core/modules/mailings/advthirdparties.modules.php
index 1e04fe5459d..24ad5ee4a0b 100644
--- a/htdocs/core/modules/mailings/advthirdparties.modules.php
+++ b/htdocs/core/modules/mailings/advthirdparties.modules.php
@@ -200,9 +200,10 @@ class mailing_advthirdparties extends MailingTargets
 	 *	For example if this selector is used to extract 500 different
 	 *	emails from a text file, this function must return 500.
 	 *
-	 *	@return		int			Nb of recipients
+	 *  @param      string     $sql       Sql request to use
+	 *	@return	    int			          Nb of recipients
 	 */
-	function getNbOfRecipients($sql)
+	function getNbOfRecipients($sql='')
 	{
 		global $conf;