diff --git a/app/code/Magento/Catalog/Block/Product/View/Options/Type/Select.php b/app/code/Magento/Catalog/Block/Product/View/Options/Type/Select.php
index 7da80121645d24a199e980a2df32a05aa918145c..cedd7b1f845981a902617fc90a8a4896bf5642c0 100644
--- a/app/code/Magento/Catalog/Block/Product/View/Options/Type/Select.php
+++ b/app/code/Magento/Catalog/Block/Product/View/Options/Type/Select.php
@@ -46,7 +46,7 @@ class Select extends \Magento\Catalog\Block\Product\View\Options\AbstractOptions
             if ($_option->getType() == \Magento\Catalog\Model\Product\Option::OPTION_TYPE_DROP_DOWN) {
                 $select->setName('options[' . $_option->getid() . ']')->addOption('', __('-- Please Select --'));
             } else {
-                $select->setName('options[' . $_option->getid() . ']');
+                $select->setName('options[' . $_option->getid() . '][]');
                 $select->setClass('multiselect admin__control-multiselect' . $require . ' product-custom-option');
             }
             foreach ($_option->getValues() as $_value) {