diff --git a/app/models.py b/app/models.py
index 38f23deff..abbf49204 100644
--- a/app/models.py
+++ b/app/models.py
@@ -1374,6 +1374,8 @@ class ServiceEmailReplyTo(db.Model):
 
     def serialize(self):
         return {
+            'id': str(self.id),
+            'service_id': str(self.service_id),
             'email_address': self.email_address,
             'is_default': self.is_default,
             'created_at': self.created_at.strftime(DATETIME_FORMAT),
diff --git a/tests/app/service/test_rest.py b/tests/app/service/test_rest.py
index dd1e5fbb3..5b267be2c 100644
--- a/tests/app/service/test_rest.py
+++ b/tests/app/service/test_rest.py
@@ -2186,11 +2186,15 @@ def test_get_email_reply_to_addresses_with_multiple_email_addresses(client, noti
     assert len(json_response) == 2
     assert response.status_code == 200
 
+    assert json_response[0]['id'] == str(reply_to_a.id)
+    assert json_response[0]['service_id'] == str(reply_to_a.service_id)
     assert json_response[0]['email_address'] == 'test_a@mail.com'
     assert json_response[0]['is_default']
     assert json_response[0]['created_at']
     assert not json_response[0]['updated_at']
 
+    assert json_response[1]['id'] == str(reply_to_b.id)
+    assert json_response[1]['service_id'] == str(reply_to_b.service_id)
     assert json_response[1]['email_address'] == 'test_b@mail.com'
     assert not json_response[1]['is_default']
     assert json_response[1]['created_at']