diff --git a/hosts/ocaml/bin/sx_server.ml b/hosts/ocaml/bin/sx_server.ml
index 1bdade7..a53415a 100644
--- a/hosts/ocaml/bin/sx_server.ml
+++ b/hosts/ocaml/bin/sx_server.ml
@@ -329,6 +329,8 @@ let setup_browser_stubs env =
   bind "dom-get-data" (fun _args -> Nil);
   bind "event-detail" (fun _args -> Nil);
   bind "promise-then" (fun _args -> Nil);
+  bind "promise-delayed" (fun args ->
+    match args with _ :: [v] -> v | _ -> Nil);
   bind "schedule-idle" (fun _args -> Nil);
   bind "dom-query" (fun _args -> Nil);
   bind "dom-query-all" (fun _args -> List []);