diff --git a/src/Extension/ExtendableTrait.php b/src/Extension/ExtendableTrait.php
index 935e302e2..45f292765 100644
--- a/src/Extension/ExtendableTrait.php
+++ b/src/Extension/ExtendableTrait.php
@@ -435,7 +435,7 @@ public function extendableGet($name)
             }
         }
 
-        $parent = get_parent_class($this);
+        $parent = get_parent_class();
         if ($parent !== false && method_exists($parent, '__get')) {
             return parent::__get($name);
         }
@@ -504,7 +504,7 @@ public function extendableCall($name, $params = null)
             return call_user_func_array($callable, $params);
         }
 
-        $parent = get_parent_class($this);
+        $parent = get_parent_class();
         if ($parent !== false && method_exists($parent, '__call')) {
             return parent::__call($name, $params);
         }