diff --git a/src/Symfony/Component/HttpClient/Response/AmpResponse.php b/src/Symfony/Component/HttpClient/Response/AmpResponse.php
index e5d0bb213f..c553dad6de 100644
--- a/src/Symfony/Component/HttpClient/Response/AmpResponse.php
+++ b/src/Symfony/Component/HttpClient/Response/AmpResponse.php
@@ -200,7 +200,7 @@ final class AmpResponse implements ResponseInterface
 
             $options = null;
 
-            $activity[$id] = [new FirstChunk()];
+            $activity[$id][] = new FirstChunk();
 
             if ('HEAD' === $response->getRequest()->getMethod() || \in_array($info['http_code'], [204, 304], true)) {
                 $activity[$id][] = null;
diff --git a/src/Symfony/Component/HttpClient/Tests/AmpHttpClientTest.php b/src/Symfony/Component/HttpClient/Tests/AmpHttpClientTest.php
index c3bdbed0aa..e17b45a0ce 100644
--- a/src/Symfony/Component/HttpClient/Tests/AmpHttpClientTest.php
+++ b/src/Symfony/Component/HttpClient/Tests/AmpHttpClientTest.php
@@ -25,13 +25,4 @@ class AmpHttpClientTest extends HttpClientTestCase
     {
         $this->markTestSkipped('A real proxy server would be needed.');
     }
-
-    public function testInformationalResponseStream()
-    {
-        if (getenv('TRAVIS_PULL_REQUEST')) {
-            $this->markTestIncomplete('This test always fails on Travis.');
-        }
-
-        parent::testInformationalResponseStream();
-    }
 }