diff --git a/packages/backend/src/server/api/mastodon/converters.ts b/packages/backend/src/server/api/mastodon/converters.ts
index 9084643795..6469d9c97b 100644
--- a/packages/backend/src/server/api/mastodon/converters.ts
+++ b/packages/backend/src/server/api/mastodon/converters.ts
@@ -74,3 +74,13 @@ export function convertStatus(status: Entity.Status) {
 
 	return status;
 }
+
+export function convertConversation(conversation: Entity.Conversation) {
+	conversation.id = convertId(conversation.id, IdType.MastodonId);
+	conversation.accounts = conversation.accounts.map(convertAccount);
+	if (conversation.last_status) {
+		conversation.last_status = convertStatus(conversation.last_status);
+	}
+
+	return conversation;
+}
diff --git a/packages/backend/src/server/api/mastodon/endpoints/timeline.ts b/packages/backend/src/server/api/mastodon/endpoints/timeline.ts
index d54594327a..0a4da322d7 100644
--- a/packages/backend/src/server/api/mastodon/endpoints/timeline.ts
+++ b/packages/backend/src/server/api/mastodon/endpoints/timeline.ts
@@ -1,7 +1,12 @@
 import Router from "@koa/router";
 import { getClient } from "../ApiMastodonCompatibleService.js";
 import { ParsedUrlQuery } from "querystring";
-import { convertAccount, convertList, convertStatus } from "../converters.js";
+import {
+	convertAccount,
+	convertConversation,
+	convertList,
+	convertStatus,
+} from "../converters.js";
 import { convertId, IdType } from "../../index.js";
 
 export function limitToInt(q: ParsedUrlQuery) {
@@ -136,7 +141,9 @@ export function apiTimelineMastodon(router: Router): void {
 			const data = await client.getConversationTimeline(
 				convertTimelinesArgsId(limitToInt(ctx.query)),
 			);
-			ctx.body = data.data;
+			ctx.body = data.data.map((conversation) =>
+				convertConversation(conversation),
+			);
 		} catch (e: any) {
 			console.error(e);
 			console.error(e.response.data);