diff --git a/htdocs/fichinter/class/fichinter.class.php b/htdocs/fichinter/class/fichinter.class.php
index c1e7a3aaca2..336e023c0ac 100644
--- a/htdocs/fichinter/class/fichinter.class.php
+++ b/htdocs/fichinter/class/fichinter.class.php
@@ -1264,7 +1264,7 @@ class FichinterLigne extends CommonObjectLine
 
 		$this->db->begin();
 
-		$sql = "SELECT SUM(duree) as total_duration";
+		$sql = "SELECT SUM(duree) as total_duration, min(date) as dateo, max(date) as datee ";
 		$sql.= " FROM ".MAIN_DB_PREFIX."fichinterdet";
 		$sql.= " WHERE fk_fichinter=".$this->fk_fichinter;
 
@@ -1278,6 +1278,8 @@ class FichinterLigne extends CommonObjectLine
 
 			$sql = "UPDATE ".MAIN_DB_PREFIX."fichinter";
 			$sql.= " SET duree = ".$total_duration;
+			$sql.= " , dateo = ".(! empty($obj->dateo)?"'".$this->db->idate($obj->dateo)."'":"null");
+			$sql.= " , datee = ".(! empty($obj->datee)?"'".$this->db->idate($obj->datee)."'":"null");
 			$sql.= " WHERE rowid = ".$this->fk_fichinter;
 			$sql.= " AND entity = ".$conf->entity;