diff --git a/src/web/app/init.ts b/src/web/app/init.ts
index 0bb687ec6a..652cbfde40 100644
--- a/src/web/app/init.ts
+++ b/src/web/app/init.ts
@@ -18,7 +18,9 @@ require('./common/tags');
 
 console.info(`Misskey v${VERSION} (葵 aoi)`);
 
-document.domain = CONFIG.host;
+if (CONFIG.host != 'localhost') {
+	document.domain = CONFIG.host;
+}
 
 { // Set lang attr
 	const html = document.documentElement;