diff --git a/lib/RetailCrm/ApiClient.php b/lib/RetailCrm/ApiClient.php
index 8aa0eb6..9d246a3 100644
--- a/lib/RetailCrm/ApiClient.php
+++ b/lib/RetailCrm/ApiClient.php
@@ -831,7 +831,7 @@ class ApiClient
         return $this->client->makeRequest(
             sprintf('/store/setting/%s/edit', $configuration['code']),
             Client::METHOD_POST,
-            $configuration
+            array('configuration' => json_encode($configuration))
         );
     }