diff --git a/pica-mail/docker-compose.yml b/pica-mail/docker-compose.yml
index 8f75a9662d2216b9d034fabbd9ac6bfb3a24ce64..3c31cc822177042ac2462e57d13ffbc4f16656c4 100644
--- a/pica-mail/docker-compose.yml
+++ b/pica-mail/docker-compose.yml
@@ -34,8 +34,7 @@ services:
 
   mail-mta:
     image: registry.picasoft.net/pica-mail-mta
-    build:
-      dockerfile: ./pica-mail-mta/Dockerfile
+    build: ./pica-mail-mta/Dockerfile
     container_name: pica-mail-mta
     ports:
       - "25:25"