diff --git a/apps/httpd/request_parser.rl b/apps/httpd/request_parser.rl
index 1a168e10f4..7399131b93 100644
--- a/apps/httpd/request_parser.rl
+++ b/apps/httpd/request_parser.rl
@@ -19,6 +19,8 @@
  * Copyright (C) 2014 Cloudius Systems, Ltd.
  */
 
+#pragma once
+
 #include "core/ragel.hh"
 #include <memory>
 #include <unordered_map>