diff --git a/include/ccf/js/registry.h b/include/ccf/js/registry.h
index edfdb02b83e4..fab02e4b173f 100644
--- a/include/ccf/js/registry.h
+++ b/include/ccf/js/registry.h
@@ -1,5 +1,6 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the Apache 2.0 License.
+#pragma once
 
 // CCF
 #include "ccf/app_interface.h"