diff --git a/docker-compose.yml b/docker-compose.yml
index f575fbc..6d6d546 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -122,6 +122,7 @@ services:
             - XMPP_DOMAIN
             - XMPP_AUTH_DOMAIN
             - XMPP_INTERNAL_MUC_DOMAIN
+            - XMPP_MUC_DOMAIN
             - XMPP_SERVER
             - JICOFO_COMPONENT_SECRET
             - JICOFO_AUTH_USER