diff --git a/docs/deployment-on-heroku.rst b/docs/deployment-on-heroku.rst
index c681d508..82bdbace 100644
--- a/docs/deployment-on-heroku.rst
+++ b/docs/deployment-on-heroku.rst
@@ -16,7 +16,7 @@ You can either push the 'deploy' button in your generated README.rst or run thes
     heroku addons:create heroku-redis:hobby-dev
     heroku addons:create mailgun
 
-    heroku config:set DJANGO_ADMIN_URL=`openssl rand -base64 64`
+    heroku config:set DJANGO_ADMIN_URL=`openssl rand -base64 32`
     heroku config:set DJANGO_SECRET_KEY=`openssl rand -base64 64`
     heroku config:set DJANGO_SETTINGS_MODULE='config.settings.production'
     heroku config:set DJANGO_ALLOWED_HOSTS='.herokuapp.com'