diff --git a/public/index.php b/public/index.php
index 60c8d8a..ac7e7b5 100755
--- a/public/index.php
+++ b/public/index.php
@@ -25,7 +25,7 @@ $app = require __DIR__.'/../bootstrap/app.php';
 */
 
 ob_start("ob_gzhandler");
-header('Content-Type: application/json');
+header("Content-Type: application/json");
 header("Access-Control-Allow-Origin: *");
 header("Access-Control-Allow-Methods: *");
 $app->run();