diff --git a/packages/backend/src/core/WebhookTestService.ts b/packages/backend/src/core/WebhookTestService.ts
index a41f41c44d..4a31c1d17a 100644
--- a/packages/backend/src/core/WebhookTestService.ts
+++ b/packages/backend/src/core/WebhookTestService.ts
@@ -254,7 +254,7 @@ function toPackedUserDetailedNotMe(user: MiUser, override?: Packed<'UserDetailed
 		isRenoteMuted: false,
 		notify: 'none',
 		withReplies: true,
-		ListenBrainz: null,
+		listenbrainz: null,
 		...override,
 	};
 }