diff --git a/src/appstore.js b/src/appstore.js
index da384134f..e8f8002c7 100644
--- a/src/appstore.js
+++ b/src/appstore.js
@@ -100,7 +100,7 @@ async function registerUser(email, password) {
     assert.strictEqual(typeof password, 'string');
 
     const [error, response] = await safe(superagent.post(`${settings.apiServerOrigin()}/api/v1/register_user`)
-        .send({ email, password })
+        .send({ email, password, utmSource: 'cloudron-dashboard' })
         .timeout(30 * 1000)
         .ok(() => true));
 
diff --git a/src/routes/test/appstore-test.js b/src/routes/test/appstore-test.js
index f0eed273d..2cb008efe 100644
--- a/src/routes/test/appstore-test.js
+++ b/src/routes/test/appstore-test.js
@@ -85,7 +85,7 @@ describe('Appstore Cloudron Registration API - existing user', function () {
 
     it('can setup subscription', async function () {
         const scope1 = nock(settings.apiServerOrigin())
-            .post('/api/v1/register_user', (body) => body.email && body.password)
+            .post('/api/v1/register_user', (body) => body.email && body.password && body.utmSource)
             .reply(201, {});
 
         const scope2 = nock(settings.apiServerOrigin())
@@ -142,7 +142,7 @@ describe('Appstore Cloudron Registration API - new user signup', function () {
 
     it('can setup subscription', async function () {
         const scope1 = nock(settings.apiServerOrigin())
-            .post('/api/v1/register_user', (body) => body.email && body.password)
+            .post('/api/v1/register_user', (body) => body.email && body.password && body.utmSource)
             .reply(201, {});
 
         const scope2 = nock(settings.apiServerOrigin())