diff --git a/src/server/api/mastodon/index.ts b/src/server/api/mastodon/index.ts
index bdd1fdf0f1..e14256be0f 100644
--- a/src/server/api/mastodon/index.ts
+++ b/src/server/api/mastodon/index.ts
@@ -49,7 +49,7 @@ router.get('/v1/instance', async ctx => { // TODO: This is a temporary implement
 		title: meta.name || 'Misskey',
 		description: meta.description || '',
 		email: meta.maintainer.email,
-		version: `0.0.0:compatible:misskey:${pkg.version}`, // TODO: How to tell about that this is an api for compatibility?
+		version: `0.0.0 (compatible; Misskey)`, // TODO: commit hash
 		thumbnail: meta.bannerUrl,
 		/*
 		urls: {