diff --git a/CHANGELOG.md b/CHANGELOG.md
index bf0a44c..5769cc8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+- Add json-api header in responses
+
 ### Changed
 - Removed hard dependency to the form component (it is still required for many features)
 
diff --git a/src/Response/Listener/SerializeOnKernelView.php b/src/Response/Listener/SerializeOnKernelView.php
index f3ee931..e106417 100644
--- a/src/Response/Listener/SerializeOnKernelView.php
+++ b/src/Response/Listener/SerializeOnKernelView.php
@@ -19,6 +19,8 @@
  */
 class SerializeOnKernelView implements EventSubscriberInterface
 {
+    public const CONTENT_TYPE = 'application/vnd.api+json';
+
     /**
      * @var SerializerInterface
      */
@@ -49,13 +51,15 @@ public function onKernelView(ViewEvent $event)
 
         $context = $this->contextBuilderChain->buildContext([], $response);
 
-        $event->setResponse(
-            new JsonResponse(
-                $this->serializer->serialize($response, 'json', $context),
-                $response->httpStatus(),
-                $response->headers(),
-                true
-            )
+        $jsonResponse = new JsonResponse(
+            $this->serializer->serialize($response, 'json', $context),
+            $response->httpStatus(),
+            $response->headers(),
+            true
         );
+
+        $jsonResponse->headers->set('Content-Type', self::CONTENT_TYPE);
+
+        $event->setResponse($jsonResponse);
     }
 }
diff --git a/tests/Melodiia/Response/Listener/SerializeOnKernelViewTest.php b/tests/Melodiia/Response/Listener/SerializeOnKernelViewTest.php
index f32153c..6c445c6 100644
--- a/tests/Melodiia/Response/Listener/SerializeOnKernelViewTest.php
+++ b/tests/Melodiia/Response/Listener/SerializeOnKernelViewTest.php
@@ -13,6 +13,7 @@
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\HttpFoundation\JsonResponse;
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\Event\ViewEvent;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpKernel\KernelEvents;
@@ -29,12 +30,26 @@ class SerializeOnKernelViewTest extends TestCase
     /** @var SerializeOnKernelView */
     private $listener;
 
+    /** @var ApiResponse */
+    private $dummyResponse;
+
     public function setUp(): void
     {
         $this->serializer = $this->prophesize(SerializerInterface::class);
         $this->contextChain = $this->prophesize(ContextBuilderChainInterface::class);
         $this->contextChain->buildContext(Argument::cetera())->willReturn([]);
         $this->listener = new SerializeOnKernelView($this->serializer->reveal(), $this->contextChain->reveal());
+        $this->dummyResponse = new class() implements ApiResponse {
+            public function httpStatus(): int
+            {
+                return 200;
+            }
+
+            public function headers(): array
+            {
+                return [];
+            }
+        };
     }
 
     public function tearDown(): void
@@ -42,6 +57,7 @@ public function tearDown(): void
         $this->serializer = null;
         $this->contextChain = null;
         $this->listener = null;
+        $this->dummyResponse = null;
     }
 
     public function testItSubscribeOnKernelView()
@@ -52,27 +68,44 @@ public function testItSubscribeOnKernelView()
 
     public function testItTransformApiResponse()
     {
-        $response = new class() implements ApiResponse {
-            public function httpStatus(): int
-            {
-                return 200;
-            }
+        $this->serializer->serialize($this->dummyResponse, Argument::cetera())->shouldBeCalled()->willReturn('"hello"');
+        $event = new ViewEvent(
+            $this->prophesize(HttpKernelInterface::class)->reveal(),
+            $this->prophesize(Request::class)->reveal(),
+            HttpKernelInterface::MASTER_REQUEST,
+            $this->dummyResponse
+        );
 
-            public function headers(): array
-            {
-                return [];
-            }
-        };
-        $this->serializer->serialize($response, Argument::cetera())->shouldBeCalled()->willReturn('"hello"');
+        $this->listener->onKernelView($event);
+
+        $this->assertInstanceOf(JsonResponse::class, $event->getResponse());
+    }
+
+    public function testItDoesNotTransformSymfonyResponse()
+    {
+        $response = new Response('<h1>Containing HTML?</h1>');
         $event = new ViewEvent(
             $this->prophesize(HttpKernelInterface::class)->reveal(),
             $this->prophesize(Request::class)->reveal(),
             HttpKernelInterface::MASTER_REQUEST,
             $response
         );
+        $this->listener->onKernelView($event);
+        $this->assertSame(null, $event->getResponse());
+    }
+
+    public function testItSendsTheRightContentType()
+    {
+        $this->serializer->serialize($this->dummyResponse, Argument::cetera())->shouldBeCalled()->willReturn('"hello"');
+        $event = new ViewEvent(
+            $this->prophesize(HttpKernelInterface::class)->reveal(),
+            $this->prophesize(Request::class)->reveal(),
+            HttpKernelInterface::MASTER_REQUEST,
+            $this->dummyResponse
+        );
 
         $this->listener->onKernelView($event);
 
-        $this->assertInstanceOf(JsonResponse::class, $event->getResponse());
+        $this->assertEquals($event->getResponse()->headers->get('content-type'), SerializeOnKernelView::CONTENT_TYPE);
     }
 }