diff --git a/lib/internal/Magento/Framework/HTTP/Client/Curl.php b/lib/internal/Magento/Framework/HTTP/Client/Curl.php
index 713ea19ab9789..8efb04220a099 100644
--- a/lib/internal/Magento/Framework/HTTP/Client/Curl.php
+++ b/lib/internal/Magento/Framework/HTTP/Client/Curl.php
@@ -337,7 +337,7 @@ public function getStatus()
      * Make request
      * @param string $method
      * @param string $uri
-     * @param array $params
+     * @param array array|string $params
      * @return void
      * @SuppressWarnings(PHPMD.CyclomaticComplexity)
      * @SuppressWarnings(PHPMD.NPathComplexity)
@@ -348,7 +348,7 @@ protected function makeRequest($method, $uri, $params = [])
         $this->curlOption(CURLOPT_URL, $uri);
         if ($method == 'POST') {
             $this->curlOption(CURLOPT_POST, 1);
-            $this->curlOption(CURLOPT_POSTFIELDS, http_build_query($params));
+            $this->curlOption(CURLOPT_POSTFIELDS, is_array($params) ? http_build_query($params) : $params);
         } elseif ($method == "GET") {
             $this->curlOption(CURLOPT_HTTPGET, 1);
         } else {