diff --git a/htdocs/variants/class/ProductCombination.class.php b/htdocs/variants/class/ProductCombination.class.php
index 0e8f69958dc..a525bb41319 100644
--- a/htdocs/variants/class/ProductCombination.class.php
+++ b/htdocs/variants/class/ProductCombination.class.php
@@ -281,7 +281,9 @@ class ProductCombination
 	{
 		global $conf;
 
-		$sql = "SELECT rowid, fk_product_parent, fk_product_child, variation_price, variation_price_percentage, variation_weight FROM ".MAIN_DB_PREFIX."product_attribute_combination WHERE fk_product_parent = ".((int) $fk_product_parent)." AND entity IN (".getEntity('product').")";
+		$sql = "SELECT rowid, fk_product_parent, fk_product_child, variation_price, variation_price_percentage, variation_ref_ext, variation_weight";
+		$sql.= " FROM ".MAIN_DB_PREFIX."product_attribute_combination";
+		$sql.= " WHERE fk_product_parent = ".((int) $fk_product_parent)." AND entity IN (".getEntity('product').")";
 
 		$query = $this->db->query($sql);