diff --git a/app/code/Magento/GroupedImportExport/Model/Import/Product/Type/Grouped.php b/app/code/Magento/GroupedImportExport/Model/Import/Product/Type/Grouped.php
index 5547a59d291b7..83ffc3dfb253e 100644
--- a/app/code/Magento/GroupedImportExport/Model/Import/Product/Type/Grouped.php
+++ b/app/code/Magento/GroupedImportExport/Model/Import/Product/Type/Grouped.php
@@ -99,7 +99,7 @@ public function saveData()
                     }
                     $scope = $this->_entityModel->getRowScope($rowData);
                     if (Product::SCOPE_DEFAULT == $scope) {
-                        $productData = $newSku[$rowData[Product::COL_SKU]];
+                        $productData = $newSku[strtolower($rowData[Product::COL_SKU])];
                     } else {
                         $colAttrSet = Product::COL_ATTR_SET;
                         $rowData[$colAttrSet] = $productData['attr_set_code'];