diff --git a/docker-compose.yml b/docker-compose.yml
index 67a42ed..9da50a8 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -3,7 +3,7 @@ services:
   db:
     image: mariadb
     restart: always
-    user: 1000:1000
+    user: ${USER_GROUP}
     volumes:
       - ./db:/var/lib/mysql
   drupal:
diff --git a/env.sample b/env.sample
index 75deea0..e6aa02c 100644
--- a/env.sample
+++ b/env.sample
@@ -1,3 +1,5 @@
+USER_GROUP=1000:1000
+
 MARIADB_RANDOM_ROOT_PASSWORD=true
 MARIADB_DATABASE=artxibo
 MARIADB_USER=artxibo