diff --git a/lam-packaging/docker/.env b/lam-packaging/docker/.env
index 98340b2e..9f5904f0 100644
--- a/lam-packaging/docker/.env
+++ b/lam-packaging/docker/.env
@@ -8,6 +8,8 @@ LDAP_SERVER=ldap://ldap:389
 LDAP_USER=cn=admin,dc=my-domain,dc=com
 # LDAP admin password
 LDAP_ADMIN_PASSWORD=adminpw
+# default language, e.g. en_US, de_DE, fr_FR, ...
+LAM_LANG=en_US
 
 # LAM configuration master password and password for server profile "lam"
 LAM_PASSWORD=lam