diff --git a/src/AssetResponder.php b/src/AssetResponder.php
index d4989a4..289d062 100644
--- a/src/AssetResponder.php
+++ b/src/AssetResponder.php
@@ -2,7 +2,8 @@
 namespace Hkt\Psr7Asset;
 
 use Psr\Http\Message\ResponseInterface;
-use Zend\Diactoros\Stream;
+use Zend\Diactoros\CallbackStream;
+use SplFileObject;
 
 /**
  *
@@ -95,9 +96,18 @@ protected function isValidAsset()
      */
     protected function ok(ResponseInterface $response)
     {
+        $path = $this->data->asset->path;
+        $callable = function () use ($path) {
+            $file = new SplFileObject($path);
+            while (! $file->eof()) {
+                echo $file->fgets();
+            }
+
+            return '';
+        };
         return $response
             ->withStatus(200)
-            ->withBody(new Stream($this->data->asset->path))
+            ->withBody(new CallbackStream($callable))
             ->withHeader('Content-Length', (string) filesize($this->data->asset->path))
             ->withHeader('Content-Type', $this->data->asset->type)
         ;
diff --git a/tests/src/AssetResponderTest.php b/tests/src/AssetResponderTest.php
index 3752fea..1cb2451 100644
--- a/tests/src/AssetResponderTest.php
+++ b/tests/src/AssetResponderTest.php
@@ -43,7 +43,11 @@ public function test__invoke_Ok()
         $actual = $response->getHeaderLine('Content-Type');
         $this->assertSame($type, $actual);
 
-        $actual = (string) $response->getBody();
+        ob_start();
+        (string) $response->getBody();
+        $actual = ob_get_contents();
+        ob_end_clean();
+
         $expect = file_get_contents($path);
         $this->assertSame($expect, $actual);
     }