diff --git a/compose.yml b/compose.yml
index f12a95c..87190b8 100644
--- a/compose.yml
+++ b/compose.yml
@@ -11,7 +11,7 @@ services:
     environment:
       - ALLOW_EMPTY_PASSWORD=yes
       - DISCOURSE_HOST=${DOMAIN}
-      - DISCOURSE_DATABASE_HOST=db
+      - DISCOURSE_DATABASE_HOST=${STACK_NAME}_db
       - DISCOURSE_DATABASE_USER=discourse
       - DISCOURSE_DATABASE_NAME=discourse
       - DISCOURSE_DATABASE_PASSWORD_FILE=/run/secrets/db_password