diff --git a/packages/backend/src/GlobalModule.ts b/packages/backend/src/GlobalModule.ts
index 1e4164c7f7b4..0f69cf93a910 100644
--- a/packages/backend/src/GlobalModule.ts
+++ b/packages/backend/src/GlobalModule.ts
@@ -127,7 +127,7 @@ const $meta: Provider = {
 				switch (type) {
 					case 'metaUpdated': {
 						for (const key in body) {
-							meta[key] = body[key];
+							(meta as any)[key] = (body as any)[key];
 						}
 						meta.proxyAccount = null; // joinなカラムは通常取ってこないので
 						break;