diff --git a/src/Symfony/Component/HttpClient/HttpClientTrait.php b/src/Symfony/Component/HttpClient/HttpClientTrait.php
index 1c5e4578c7..9fc37f7299 100644
--- a/src/Symfony/Component/HttpClient/HttpClientTrait.php
+++ b/src/Symfony/Component/HttpClient/HttpClientTrait.php
@@ -56,6 +56,10 @@ trait HttpClientTrait
             }
         }
 
+        if (!isset($options['normalized_headers']['accept'])) {
+            $options['normalized_headers']['accept'] = [$options['headers'][] = 'Accept: *'];
+        }
+
         if (isset($options['body'])) {
             $options['body'] = self::normalizeBody($options['body']);
         }
diff --git a/src/Symfony/Component/HttpClient/Tests/HttpClientTraitTest.php b/src/Symfony/Component/HttpClient/Tests/HttpClientTraitTest.php
index 7971b79143..559f2b6227 100644
--- a/src/Symfony/Component/HttpClient/Tests/HttpClientTraitTest.php
+++ b/src/Symfony/Component/HttpClient/Tests/HttpClientTraitTest.php
@@ -172,7 +172,7 @@ class HttpClientTraitTest extends TestCase
     public function testAuthBearerOption()
     {
         [, $options] = self::prepareRequest('POST', 'http://example.com', ['auth_bearer' => 'foobar'], HttpClientInterface::OPTIONS_DEFAULTS);
-        $this->assertSame(['Authorization: Bearer foobar'], $options['headers']);
+        $this->assertSame(['Accept: *', 'Authorization: Bearer foobar'], $options['headers']);
         $this->assertSame(['Authorization: Bearer foobar'], $options['normalized_headers']['authorization']);
     }