diff --git a/src/PersistentData/Model/Model.php b/src/PersistentData/Model/Model.php
index 23b2840..c5f566c 100644
--- a/src/PersistentData/Model/Model.php
+++ b/src/PersistentData/Model/Model.php
@@ -41,7 +41,7 @@ abstract class Model
     {
         $array = [];
 
-        foreach (self::getFields() as $key) {
+        foreach (static::getFields() as $key) {
             $method = 'get' . str_replace('_', '', ucwords($key, '_'));
 
             if (method_exists($this, $method)) {