diff --git a/src/webapp.ts b/src/webapp.ts
index 8cc1cf4..6f184c0 100644
--- a/src/webapp.ts
+++ b/src/webapp.ts
@@ -79,13 +79,13 @@ async function loadApp(path: string): Promise<App | undefined> {
         return mod.default as App
 }
 
-export function toResponse(source: string | Child | Response): Response {
+export async function toResponse(source: string | Child | Response): Promise<Response> {
     if (source instanceof Response)
         return source
     else if (typeof source === "string")
         return new Response(source)
     else
-        return new Response(renderToString(source), {
+        return new Response(await source?.toString(), {
             headers: {
                 "Content-Type": "text/html; charset=utf-8"
             }