diff --git a/types/defines/rpc.d.ts b/types/defines/rpc.d.ts
index e30595768f7..c8bfcb14046 100644
--- a/types/defines/rpc.d.ts
+++ b/types/defines/rpc.d.ts
@@ -106,6 +106,7 @@ declare namespace Rpc {
   type Result<R> =
     R extends Stubable ? Promise<Stub<R>> & Provider<R>
     : R extends Serializable ? Promise<Stubify<R> & MaybeDisposable<R>> & MaybeProvider<R>
+    : R extends { [K in keyof R]: Serializable } ? Promise<Stubify<R> & MaybeDisposable<R>> & MaybeProvider<R>
     : never;
 
   // Type for method or property on an RPC interface.