diff --git a/src/Forms/VariationForm.php b/src/Forms/VariationForm.php
index fa30fcdc..969a7215 100644
--- a/src/Forms/VariationForm.php
+++ b/src/Forms/VariationForm.php
@@ -130,7 +130,7 @@ protected function getFormFields($controller = null)
                     '',
                     ['attribute' => $attribute->Label]
                 ),
-                $product->possibleValuesForAttributeType($attribute)->sort('Sort', 'ASC')
+                $product->possibleValuesForAttributeType($attribute)->sort(['Sort' => 'ASC'])
             );
 
             if ($attributeDropdown) {