diff --git a/htdocs/societe/class/api_thirdparties.class.php b/htdocs/societe/class/api_thirdparties.class.php
index db7eec3096e..c4781c0df6a 100644
--- a/htdocs/societe/class/api_thirdparties.class.php
+++ b/htdocs/societe/class/api_thirdparties.class.php
@@ -150,6 +150,7 @@ class Thirdparties extends DolibarrApi
 			$sql .= ", sc.fk_soc, sc.fk_user"; // We need these fields in order to filter by sale (including the case where the user can only see his prospects)
 		}
 		$sql .= " FROM ".MAIN_DB_PREFIX."societe as t";
+		$sql .= " LEFT JOIN ".MAIN_DB_PREFIX."societe_extrafields AS ef ON ef.fk_object = t.rowid";	// So we will be able to filter on extrafields
 		if ($category > 0) {
 			if ($mode != 4) {
 				$sql .= ", ".MAIN_DB_PREFIX."categorie_societe as c";