diff --git a/src/remote/activitypub/models/person.ts b/src/remote/activitypub/models/person.ts
index be035097b..20e594ff1 100644
--- a/src/remote/activitypub/models/person.ts
+++ b/src/remote/activitypub/models/person.ts
@@ -49,6 +49,7 @@ export async function createPerson(value: any, resolver?: Resolver): Promise<IUs
 		object == null ||
 		object.type !== 'Person' ||
 		typeof object.preferredUsername !== 'string' ||
+		typeof object.inbox !== 'string' ||
 		!validateUsername(object.preferredUsername) ||
 		!isValidName(object.name == '' ? null : object.name)
 	) {