diff --git a/packages/backend/src/server/api/mastodon/endpoints/status.ts b/packages/backend/src/server/api/mastodon/endpoints/status.ts
index 759faeef9..b6475dcf2 100644
--- a/packages/backend/src/server/api/mastodon/endpoints/status.ts
+++ b/packages/backend/src/server/api/mastodon/endpoints/status.ts
@@ -59,6 +59,9 @@ export function apiStatusMastodon(router: Router): void {
 			}
 			if (!body.media_ids) body.media_ids = undefined;
 			if (body.media_ids && !body.media_ids.length) body.media_ids = undefined;
+			if (body.media_ids) {
+				body.media_ids = (body.media_ids as string[]).map(p => convertId(p, IdType.CalckeyId));
+			}
 			const { sensitive } = body;
 			body.sensitive =
 				typeof sensitive === "string" ? sensitive === "true" : sensitive;