diff --git a/src/server/api/private/signup.ts b/src/server/api/private/signup.ts
index c1f06fd33..b8793582f 100644
--- a/src/server/api/private/signup.ts
+++ b/src/server/api/private/signup.ts
@@ -143,6 +143,7 @@ export default async (ctx: Koa.BaseContext) => {
 		}));
 
 		await transactionalEntityManager.save(new UsedUsername({
+			createdAt: new Date(),
 			username: username.toLowerCase(),
 		}));
 	});