diff --git a/vendor/magento/module-catalog-import-export/Model/Import/Product.php b/vendor/magento/module-catalog-import-export/Model/Import/Product.php
index 5f4a512ec34..71730f030a6 100644
--- a/vendor/magento/module-catalog-import-export/Model/Import/Product.php
+++ b/vendor/magento/module-catalog-import-export/Model/Import/Product.php
@@ -1586,7 +1586,9 @@ class Product extends \Magento\ImportExport\Model\Import\Entity\AbstractEntity
                 }
                 $rowScope = $this->getRowScope($rowData);
 
-                $rowData[self::URL_KEY] = $this->getUrlKey($rowData);
+                if ($this->isNeedToValidateUrlKey($rowData)) {
+                    $rowData[self::URL_KEY] = $this->getUrlKey($rowData);
+                }
 
                 $rowSku = $rowData[self::COL_SKU];
 
@@ -2534,6 +2536,12 @@ class Product extends \Magento\ImportExport\Model\Import\Entity\AbstractEntity
      */
     private function isNeedToValidateUrlKey($rowData)
     {
+        $sku = $rowData[self::COL_SKU];
+        if (Import::BEHAVIOR_APPEND == $this->getBehavior()
+            && $this->isSkuExist($sku) && empty($rowData[self::URL_KEY])
+        ) {
+            return false;
+        }
         return (!empty($rowData[self::URL_KEY]) || !empty($rowData[self::COL_NAME]))
             && (empty($rowData[self::COL_VISIBILITY])
             || $rowData[self::COL_VISIBILITY]