diff --git a/src/libstore/include/nix/store/dummy-store.hh b/src/libstore/include/nix/store/dummy-store.hh
index 47e3375cd..e93aad366 100644
--- a/src/libstore/include/nix/store/dummy-store.hh
+++ b/src/libstore/include/nix/store/dummy-store.hh
@@ -1,3 +1,6 @@
+#pragma once
+///@file
+
 #include "nix/store/store-api.hh"
 
 namespace nix {