diff --git a/hedgedoc/compose.yml b/hedgedoc/compose.yml
index b554b18..380c87d 100644
--- a/hedgedoc/compose.yml
+++ b/hedgedoc/compose.yml
@@ -9,6 +9,7 @@ services:
       hedgedoc_db:
         condition: service_healthy
     environment:
+      - CMD_ALLOW_EMAIL_REGISTER=false
       - CMD_DB_URL=postgres://hedgedoc:${DB_PASSWORD}@hedgedoc_db:5432/hedgedoc
       - CMD_DOMAIN=pad.eliasfink.de
       - CMD_PROTOCOL_USESSL=true