diff --git a/src/Middlewares/SetHeaderMiddleware.php b/src/Middlewares/SetHeaderMiddleware.php
index ff52e56..ad8f00d 100644
--- a/src/Middlewares/SetHeaderMiddleware.php
+++ b/src/Middlewares/SetHeaderMiddleware.php
@@ -4,6 +4,7 @@
 
 use Closure;
 use Illuminate\Http\Request;
+use Lmc\HttpConstants\Header;
 
 class SetHeaderMiddleware
 {
@@ -12,6 +13,6 @@ public function handle(Request $request, Closure $next)
         /** @var \Illuminate\Http\Response $response */
         $response = $next($request);
 
-        return $response->header('Accept', 'application/json');
+        return $response->header(Header::ACCEPT, 'application/json');
     }
 }