diff --git a/Model/Api/Product.php b/Model/Api/Product.php
index 1d923851..e182b5ea 100644
--- a/Model/Api/Product.php
+++ b/Model/Api/Product.php
@@ -251,7 +251,7 @@ protected function _buildProductData(\Magento\Catalog\Model\Product $product,  $
                 $data["visibility"] = 'true';
             }
             else {
-                $data["visibility"] = false;
+                $data["visibility"] = 'false';
             }
 
         } else {