diff --git a/gregor_django/drupal_oauth_provider/tests.py b/gregor_django/drupal_oauth_provider/tests.py
index ca2b598d..b133227b 100644
--- a/gregor_django/drupal_oauth_provider/tests.py
+++ b/gregor_django/drupal_oauth_provider/tests.py
@@ -116,7 +116,7 @@ def get_mocked_response(self):
             "name": "testmaster",
             "email": "test@testmaster.net",
             "email_verified": "True",
-            "sub": 20122
+            "sub": "20122"
         }""",
             ),
         ]
@@ -184,7 +184,7 @@ def get_id_token(self):
                 "iat": self.setup_time,
                 "aud": allowed_audience,
                 "scope": ["authenticated", "oauth_client_user"],
-                "sub": 20122,
+                "sub": "20122",
             }
         )