diff --git a/jupyter/base/values/values.yaml b/jupyter/base/values/values.yaml
index d4f361a..f4ac5fb 100644
--- a/jupyter/base/values/values.yaml
+++ b/jupyter/base/values/values.yaml
@@ -15,13 +15,13 @@ hub:
       import requests
       from datetime import datetime
       from oauthenticator.generic import GenericOAuthenticator
+      token_url = 'https://' + os.environ['NEXTCLOUD_HOST'] + '/index.php/apps/oauth2/api/v1/token'
 
       def get_nextcloud_access_token(refresh_token):
         debug = 'NEXTCLOUD_DEBUG_OAUTH' in os.environ
         client_id = os.environ['NEXTCLOUD_CLIENT_ID']
         client_secret = os.environ['NEXTCLOUD_CLIENT_SECRET']
 
-        url = 'https://' + os.environ['NEXTCLOUD_HOST'] + '/index.php/apps/oauth2/api/v1/token'
         code = refresh_token
         data = {
           'grant_type': 'refresh_token',
@@ -30,7 +30,7 @@ hub:
           'client_id': client_id,
           'client_secret': client_secret
         }
-        response = requests.post(url, data=data)
+        response = requests.post(token_url, data=data)
         if debug:
           print(response.text)
         return response.json()
@@ -102,7 +102,7 @@ hub:
       c.NextcloudOAuthenticator.username_claim = lambda r: r.get('ocs', {}).get('data', {}).get('id')
       c.NextcloudOAuthenticator.userdata_url = 'https://' + os.environ['NEXTCLOUD_HOST'] + '/ocs/v2.php/cloud/user?format=json'
       c.NextcloudOAuthenticator.authorize_url = 'https://' + os.environ['NEXTCLOUD_HOST'] + '/index.php/apps/oauth2/authorize'
-      c.NextcloudOAuthenticator.token_url = 'https://' + os.environ['NEXTCLOUD_HOST'] + '/index.php/apps/oauth2/api/v1/token'
+      c.NextcloudOAuthenticator.token_url = token_url
       c.NextcloudOAuthenticator.oauth_callback_url = 'https://' + os.environ['JUPYTER_HOST'] + '/hub/oauth_callback'
       c.NextcloudOAuthenticator.allow_all = True
       c.NextcloudOAuthenticator.refresh_pre_spawn = True