diff --git a/src/Teamleader.php b/src/Teamleader.php
index fdbca6d..b05e15c 100644
--- a/src/Teamleader.php
+++ b/src/Teamleader.php
@@ -186,7 +186,7 @@ private function doRequest(string $method, string $uri, array $parameters = []):
             }
 
             $body = $this->streamFactory->createStream($encodedParameters);
-            $request->withBody($body);
+            $request = $request->withBody($body);
         }
 
         $response = $this->client->sendRequest($request);