diff --git a/Model/Config/Source/Behavior.php b/Model/Config/Source/Behavior.php
index f199d0c..7eb73df 100644
--- a/Model/Config/Source/Behavior.php
+++ b/Model/Config/Source/Behavior.php
@@ -23,8 +23,9 @@ public function toOptionArray()
     {
         if (!$this->_options) {
             $this->_options = [
-                ['value' => \Magento\ImportExport\Model\Import::BEHAVIOR_APPEND, 'label' => __('Add/Update')], 
-                ['value' => \Magento\ImportExport\Model\Import::BEHAVIOR_REPLACE, 'label' => __('Replace')], 
+                ['value' => \Magento\ImportExport\Model\Import::BEHAVIOR_APPEND, 'label' => __('Append')],
+                ['value' => \Magento\ImportExport\Model\Import::BEHAVIOR_ADD_UPDATE, 'label' => __('Add/Update')],
+                ['value' => \Magento\ImportExport\Model\Import::BEHAVIOR_REPLACE, 'label' => __('Replace')],
                 ['value' => \Magento\ImportExport\Model\Import::BEHAVIOR_DELETE, 'label' => __('Delete')], 
             ];
         }
diff --git a/etc/config.xml b/etc/config.xml
index a540cd3..c45c287 100644
--- a/etc/config.xml
+++ b/etc/config.xml
@@ -10,7 +10,7 @@
         <fastsimpleimport>
             <default>
                 <ignore_duplicates>0</ignore_duplicates>
-                <behavior>append</behavior>
+                <behavior>add_update</behavior>
                 <entity>catalog_product</entity>
                 <validation_strategy>validation-stop-on-errors</validation_strategy>
                 <allowed_error_count>10</allowed_error_count>