diff --git a/CHANGELOG.md b/CHANGELOG.md
index 736e287..23dac68 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,8 @@ All notable changes to this project will be documented in this file.
 Updates should follow the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
 
 ## [Unreleased][unreleased]
+#### Changed
+* [BC] DefaultHandler response code 404 instead 400
 
 #### Added
 * CorsPreflightHandlerInterface - resolve multiple service registered handler error
diff --git a/src/Handlers/DefaultHandler.php b/src/Handlers/DefaultHandler.php
index 11ef4d6..598881e 100644
--- a/src/Handlers/DefaultHandler.php
+++ b/src/Handlers/DefaultHandler.php
@@ -15,6 +15,6 @@ class DefaultHandler extends BaseHandler
      */
     public function handle(array $params): ResponseInterface
     {
-        return new JsonApiResponse(IResponse::S400_BAD_REQUEST, ['status' => 'error', 'message' => 'Unknown api endpoint']);
+        return new JsonApiResponse(IResponse::S404_NOT_FOUND, ['status' => 'error', 'message' => 'Unknown api endpoint']);
     }
 }
diff --git a/tests/Handler/DefaultHandlerTest.php b/tests/Handler/DefaultHandlerTest.php
index 13abd66..e67f8f6 100644
--- a/tests/Handler/DefaultHandlerTest.php
+++ b/tests/Handler/DefaultHandlerTest.php
@@ -18,7 +18,7 @@ public function testResponse()
     {
         $defaultHandler = new DefaultHandler();
         $result = $defaultHandler->handle([]);
-        $this->assertEquals(400, $result->getCode());
+        $this->assertEquals(404, $result->getCode());
         $this->assertEquals('application/json', $result->getContentType());
         $this->assertEquals('utf-8', $result->getCharset());
         $this->assertEquals(['status' => 'error', 'message' => 'Unknown api endpoint'], $result->getPayload());