diff --git a/src/async/serializeAsync.test.ts b/src/async/serializeAsync.test.ts
index 295b0e25..bd075bfe 100644
--- a/src/async/serializeAsync.test.ts
+++ b/src/async/serializeAsync.test.ts
@@ -1,7 +1,10 @@
 import { expect, test } from "vitest";
 
-import { tsonAsyncIterator, tsonPromise } from "../index.js";
-import { createAsyncTsonSerialize } from "./serializeAsync.js";
+import { tsonAsyncIterator, tsonBigint, tsonPromise } from "../index.js";
+import {
+	createAsyncTsonSerialize,
+	createAsyncTsonStringify,
+} from "./serializeAsync.js";
 
 test("serialize promise", async () => {
 	const serialize = createAsyncTsonSerialize({
@@ -152,3 +155,66 @@ test("serialize async iterable", async () => {
 		]
 	`);
 });
+
+test("stringify async iterable + promise", async () => {
+	const stringify = createAsyncTsonStringify({
+		nonce: () => "__tson",
+		types: [tsonAsyncIterator, tsonPromise, tsonBigint],
+	});
+
+	async function* iterable() {
+		await new Promise((resolve) => setTimeout(resolve, 1));
+		yield 1n;
+		yield 2n;
+	}
+
+	const obj = {
+		foo: "bar",
+		iterable: iterable(),
+		promise: Promise.resolve(42),
+	};
+	const buffer: string[] = [];
+	for await (const value of stringify(obj, 2)) {
+		buffer.push(value.trimEnd());
+	}
+
+	// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+	const head: any = JSON.parse(buffer[1]!);
+
+	expect(buffer).toMatchInlineSnapshot(`
+		[
+		  "[",
+		  "  {\\"json\\":{\\"foo\\":\\"bar\\",\\"iterable\\":[\\"AsyncIterator\\",0,\\"__tson\\"],\\"promise\\":[\\"Promise\\",1,\\"__tson\\"]},\\"nonce\\":\\"__tson\\"}",
+		  "  ,",
+		  "  [",
+		  "    [1,[0,42]]",
+		  "    ,[0,[0,[\\"bigint\\",\\"1\\",\\"__tson\\"]]]",
+		  "    ,[0,[0,[\\"bigint\\",\\"2\\",\\"__tson\\"]]]",
+		  "    ,[0,[2]]",
+		  "  ]",
+		  "]",
+		]
+	`);
+
+	expect(head).toMatchInlineSnapshot(`
+		{
+		  "json": {
+		    "foo": "bar",
+		    "iterable": [
+		      "AsyncIterator",
+		      0,
+		      "__tson",
+		    ],
+		    "promise": [
+		      "Promise",
+		      1,
+		      "__tson",
+		    ],
+		  },
+		  "nonce": "__tson",
+		}
+	`);
+
+	expect(head.json.iterable[0]).toBe("AsyncIterator");
+	expect(head.json.promise[0]).toBe("Promise");
+});
diff --git a/src/async/serializeAsync.ts b/src/async/serializeAsync.ts
index dba7251c..5114276e 100644
--- a/src/async/serializeAsync.ts
+++ b/src/async/serializeAsync.ts
@@ -77,7 +77,7 @@ function walkerFactory(nonce: TsonNonce, types: TsonAsyncOptions["types"]) {
 					);
 				}
 
-				const valueTuple: TsonAsyncValueTuple = [idx, result.value];
+				const valueTuple: TsonAsyncValueTuple = [idx, walk(result.value)];
 				yield valueTuple;
 			} while (iterators.size > 0);
 		},