diff --git a/compose.yml b/compose.yml
index aebec84..ab3879c 100644
--- a/compose.yml
+++ b/compose.yml
@@ -33,6 +33,7 @@ services:
       - db_password
     environment:
       - DISABLE_FEDERATION
+      - DOMAIN
       - LETSENCRYPT_HOST=${DOMAIN}
       - SYNAPSE_ADMIN_EMAIL
       - SYNAPSE_REPORT_STATS=no