diff --git a/src/Fieldset.php b/src/Fieldset.php
index c2d23b98..951cf885 100644
--- a/src/Fieldset.php
+++ b/src/Fieldset.php
@@ -184,7 +184,8 @@ public function add($elementOrFieldset, array $flags = [])
             $order = $flags['priority'];
         }
 
-        $this->iterator->insert($name, $elementOrFieldset, $order);
+        // fix bug with Zend\Stdlib\PriorityQueue::insert 
+        $this->iterator->insert($elementOrFieldset, $order);
 
         if ($elementOrFieldset instanceof FieldsetInterface) {
             $this->fieldsets[$name] = $elementOrFieldset;