diff --git a/packages/backend/src/core/activitypub/type.ts b/packages/backend/src/core/activitypub/type.ts
index f48a619b33..f6f48791c9 100644
--- a/packages/backend/src/core/activitypub/type.ts
+++ b/packages/backend/src/core/activitypub/type.ts
@@ -179,9 +179,9 @@ export interface IActor extends IObject {
 		sharedInbox?: string;
 	};
 	AvatarDecorations?:{
-	angle: string;
+	angle: number;
 	flipH: boolean;
-	}
+	}[];
 	'vcard:bday'?: string;
 	'vcard:Address'?: string;
 }