diff --git a/server/tests/routes/auth.test.js b/server/tests/routes/auth.test.js
index 96d1270..ea03848 100644
--- a/server/tests/routes/auth.test.js
+++ b/server/tests/routes/auth.test.js
@@ -37,7 +37,7 @@ describe('Auth Routes', () => {
 
       const response = await request(app)
         .post('/auth/login')
-        .set('x-tenant-id', 'test-tenant') // Set tenant via header for test
+        .set('Host', 'test-tenant.example.com') // Use fake domain for subdomain extraction
         .send({
           username: 'testuser',
           password: 'password'