diff --git a/tests/unit/system/classes/AutoDatasourceTest.php b/tests/unit/system/classes/AutoDatasourceTest.php
index 16e55dcb7..14dc6f54b 100644
--- a/tests/unit/system/classes/AutoDatasourceTest.php
+++ b/tests/unit/system/classes/AutoDatasourceTest.php
@@ -7,7 +7,7 @@ use October\Rain\Halcyon\Datasource\FileDatasource;
 
 class CmsThemeTemplateFixture extends Model
 {
-    protected $fillable = ['*'];
+    protected $guarded = [];
 
     public $timestamps = false;