diff --git a/database/getChatroomMessages.php b/database/getChatroomMessages.php
index fd61bc4..bed49ce 100644
--- a/database/getChatroomMessages.php
+++ b/database/getChatroomMessages.php
@@ -1,6 +1,6 @@
 <?php
 require __DIR__ . '/../incl/util.php';
-setPlainHeader();
+setJsonHeader();
 checkClientDatabaseVersion();
 $conn = newConnection();