diff --git a/docker-compose.yml b/docker-compose.yml
index 8bdde1a7..6252727d 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -268,7 +268,7 @@ services:
         - HTTPS_PORT=${HTTPS_PORT:-443}
         - HTTP_PORT=${HTTP_PORT:-80}
         - MAILCOW_HOSTNAME=${MAILCOW_HOSTNAME}
-        - IPV4_NETWORK=
+        - IPV4_NETWORK=${IPV4_NETWORK:-172.22.1}
       volumes:
         - ./data/web:/web:ro
         - ./data/conf/rspamd/dynmaps:/dynmaps:ro