diff --git a/src/util/entities/Channel.ts b/src/util/entities/Channel.ts
index 28c3af7fa..ae05fa831 100644
--- a/src/util/entities/Channel.ts
+++ b/src/util/entities/Channel.ts
@@ -517,7 +517,7 @@ export class Channel extends BaseClass {
 			type: "Group",
 			id: `https://${webDomain}/fed/channel/${this.id}`,
 			name: this.name,
-			preferredUsername: this.name,
+			preferredUsername: this.id,
 			summary: this.topic,
 			icon: undefined,
 
diff --git a/src/util/entities/User.ts b/src/util/entities/User.ts
index 435ae3c9b..f733edd3d 100644
--- a/src/util/entities/User.ts
+++ b/src/util/entities/User.ts
@@ -298,7 +298,7 @@ export class User extends BaseClass {
 			type: "Person",
 			id: `https://${webDomain}/fed/user/${this.id}`,
 			name: this.username,
-			preferredUsername: this.username,
+			preferredUsername: this.id,
 			summary: this.bio,
 			icon: this.avatar
 				? [