diff --git a/src/HttpApi/Controllers/Controller.php b/src/HttpApi/Controllers/Controller.php
index db97691..5e551a0 100644
--- a/src/HttpApi/Controllers/Controller.php
+++ b/src/HttpApi/Controllers/Controller.php
@@ -71,7 +71,7 @@ abstract class Controller implements HttpServerInterface
             'error' => $exception->getMessage()
         ]));
 
-        $connection->send(GuzzleHttp\Psr7\str($response));
+        $connection->send(\GuzzleHttp\Psr7\str($response));
 
         $connection->close();
     }