diff --git a/roles/web-app-mastodon/templates/env.j2 b/roles/web-app-mastodon/templates/env.j2
index 4e5f172f..71418471 100644
--- a/roles/web-app-mastodon/templates/env.j2
+++ b/roles/web-app-mastodon/templates/env.j2
@@ -6,7 +6,13 @@
 LOCAL_DOMAIN={{ domains | get_domain(application_id) }}
 ALTERNATE_DOMAINS="{{ domains['web-app-mastodon'][1:] | join(',') }}"
 SINGLE_USER_MODE={{ applications | get_app_conf(application_id, 'single_user_mode') }}
-ALLOWED_PRIVATE_ADDRESSES={{ MASTODON_ALLOWED_PRIVATE_ADDRESSES }}
+ALLOWED_PRIVATE_ADDRESSES="{{ MASTODON_ALLOWED_PRIVATE_ADDRESSES }}"
+
+# Debug
+{% if MODE_DEBUG | bool %}
+RAILS_LOG_LEVEL=debug
+DEBUG=*
+{% endif %}
 
 # Credentials