diff --git a/packages/async-flow/src/types.d.ts b/packages/async-flow/src/types.d.ts
index 661462df49ef..09005178a78d 100644
--- a/packages/async-flow/src/types.d.ts
+++ b/packages/async-flow/src/types.d.ts
@@ -55,7 +55,11 @@ type HostInterface<T> = {
  * Convert an entire Host interface into what the Guest will receive.
  */
 export type GuestInterface<T> = {
-  [K in keyof T]: GuestOf<T[K]>;
+  [K in keyof T]: T[K] extends HostAsyncFuncWrapper
+    ? GuestOf<T[K]>
+    : T[K] extends object
+      ? GuestInterface<T[K]>
+      : T[K];
 };
 
 /**