diff --git a/libuavcan/include/uavcan/node/service_client.hpp b/libuavcan/include/uavcan/node/service_client.hpp
index e322eba76c..2ed6f9cff7 100644
--- a/libuavcan/include/uavcan/node/service_client.hpp
+++ b/libuavcan/include/uavcan/node/service_client.hpp
@@ -2,6 +2,8 @@
  * Copyright (C) 2014 Pavel Kirienko <pavel.kirienko@gmail.com>
  */
 
+#pragma once
+
 #include <uavcan/node/generic_publisher.hpp>
 #include <uavcan/node/generic_subscriber.hpp>