diff --git a/vendor/magento/module-configurable-product-graph-ql/Model/Variant/Collection.php b/vendor/magento/module-configurable-product-graph-ql/Model/Variant/Collection.php
index f849139281393..2206abd279df4 100644
--- a/vendor/magento/module-configurable-product-graph-ql/Model/Variant/Collection.php
+++ b/vendor/magento/module-configurable-product-graph-ql/Model/Variant/Collection.php
@@ -7,9 +7,9 @@
 
 namespace Magento\ConfigurableProductGraphQl\Model\Variant;
 
+use Exception;
 use Magento\Catalog\Api\Data\ProductInterface;
 use Magento\Catalog\Model\Product;
-use Magento\ConfigurableProduct\Model\Product\Type\Configurable;
 use Magento\ConfigurableProduct\Model\ResourceModel\Product\Type\Configurable\Product\Collection as ChildCollection;
 use Magento\ConfigurableProduct\Model\ResourceModel\Product\Type\Configurable\Product\CollectionFactory;
 use Magento\Framework\EntityManager\MetadataPool;
@@ -91,6 +91,7 @@ public function __construct(
      *
      * @param Product $product
      * @return void
+     * @throws Exception
      */
     public function addParentProduct(Product $product) : void
     {
@@ -143,6 +144,7 @@ public function getChildProductsByParentId(int $id, ContextInterface $context, a
      * @param ContextInterface $context
      * @param array $attributeCodes
      * @return array
+     * @throws Exception
      */
     private function fetch(ContextInterface $context, array $attributeCodes) : array
     {
@@ -156,6 +158,11 @@ private function fetch(ContextInterface $context, array $attributeCodes) : array
             $childCollection->setProductFilter($product);
         }
         $childCollection->addWebsiteFilter($context->getExtensionAttributes()->getStore()->getWebsiteId());
+        $linkField = $this->metadataPool->getMetadata(ProductInterface::class)->getLinkField();
+        $childCollection->getSelect()->group('e.' . $linkField);
+        $childCollection->getSelect()->columns([
+            'parent_ids' => new \Zend_Db_Expr('GROUP_CONCAT(link_table.parent_id)')
+        ]);
 
         $attributeCodes = array_unique(array_merge($this->attributeCodes, $attributeCodes));
 
@@ -173,14 +180,14 @@ private function fetch(ContextInterface $context, array $attributeCodes) : array
                 continue;
             }
             $formattedChild = ['model' => $childProduct, 'sku' => $childProduct->getSku()];
-            $parentId = (int)$childProduct->getParentId();
-            if (!isset($this->childrenMap[$parentId])) {
-                $this->childrenMap[$parentId] = [];
+            $parentIds = $childProduct->getParentIds() ? explode(',', $childProduct->getParentIds()) : [];
+            foreach ($parentIds as $parentId) {
+                if (!isset($this->childrenMap[$parentId])) {
+                    $this->childrenMap[$parentId] = [];
+                }
+                $this->childrenMap[$parentId][] = $formattedChild;
             }
-
-            $this->childrenMap[$parentId][] = $formattedChild;
         }
-
         return $this->childrenMap;
     }