diff --git a/powerdns/docker-compose.yml b/powerdns/docker-compose.yml
index bd23ab9..66e7536 100644
--- a/powerdns/docker-compose.yml
+++ b/powerdns/docker-compose.yml
@@ -36,5 +36,5 @@ services:
       - ${PDNS_VOLUME:-pdns_data}:/etc/powerdns
 
 volumes:
-  ${DB_VOLUME:-db_data}:
-  ${PDNS_VOLUME:-pdns_data}:
+  db_data:
+  pdns_data: