diff --git a/application/controllers/ArborescenceController.php b/application/controllers/ArborescenceController.php
index a1f9a0c8..bf277342 100644
--- a/application/controllers/ArborescenceController.php
+++ b/application/controllers/ArborescenceController.php
@@ -69,7 +69,7 @@ class ArborescenceController extends Zend_Controller_Action
 		if ($val != null){
 			$valuesChecked = explode(',',$val);
 			foreach($valuesChecked as $value){
-				$valuesUndetermined = $this->getNafParent($value);
+				$valuesUndetermined = array_merge($valuesUndetermined, $this->getNafParent($value));
 			}
 		}