DurableObjectNamespace losing its type?

I have a worker-configuration.d.ts that looks like this:
interface Env {
    CHATSTORE: DurableObjectNamespace<import("./build/index").ChatStore>;
}

I also have "types": ["@remix-run/cloudflare", "@cloudflare/workers-types"], in my tsconfig.json so that Env is available everywhere in my app. However, Env["CHATSTORE"] shows up as DurableObjectNamespace<any> everywhere, instead of DurableObjectNamespace<ChatStore>. How do I get that type to not devolve to any?
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