diff --git a/index.php b/index.php
index 9848cd3..3bdc6b9 100644
--- a/index.php
+++ b/index.php
@@ -176,6 +176,7 @@ function get_absolute_path($path) {
 
 function err($code,$msg) {
 	http_response_code($code);
+	header("Content-Type: application/json");
 	echo json_encode(['error' => ['code'=>intval($code), 'msg' => $msg]]);
 	exit;
 }