diff --git a/src/Castel.php b/src/Castel.php
index 78e3c8a..cab1a50 100644
--- a/src/Castel.php
+++ b/src/Castel.php
@@ -74,7 +74,7 @@ public function extend($id, Closure $callable)
         }
         $parent = $this->values[$id];
         $this->values[$id] = function ($c) use ($callable, $parent) {
-            return $callable(self::fabricate($parent, $c), $c);
+            return $callable(Castel::fabricate($parent, $c), $c);
         };
         if (property_exists($this, $id)) {
             $this->$id = $callable($this->$id, $this);