diff --git a/Slim/App.php b/Slim/App.php
index 57ef449a7..2250cffbe 100644
--- a/Slim/App.php
+++ b/Slim/App.php
@@ -349,7 +349,9 @@ public function respond(ResponseInterface $response)
             // Body
             if (!$this->isEmptyResponse($response)) {
                 $body = $response->getBody();
-                $body->rewind();
+                if ($body->isSeekable()) {
+                    $body->rewind();
+                }
                 $settings = $this->container->get('settings');
                 while (!$body->eof()) {
                     echo $body->read($settings['responseChunkSize']);