diff --git a/route/api.gnuboard.php b/route/api.gnuboard.php
index 95f6fed..55b2228 100644
--- a/route/api.gnuboard.php
+++ b/route/api.gnuboard.php
@@ -58,6 +58,6 @@ switch($action) {
 		}
 }
 
-header("Content-Type: application/json");
+set_header_content_type("json");
 echo json_encode($result);