diff --git a/src/app/api/auth/register/route.ts b/src/app/api/auth/register/route.ts
index 49faedd..6bf24e5 100644
--- a/src/app/api/auth/register/route.ts
+++ b/src/app/api/auth/register/route.ts
@@ -32,6 +32,7 @@ export async function POST(req: Request) {
   }
   const user = await prisma.user.create({
     data: {
+      userId: nickname,
       nickname,
       name,
       passwordHash: hashPassword(password),