diff --git a/compose.yml b/compose.yml
index 87631bb..29e0971 100644
--- a/compose.yml
+++ b/compose.yml
@@ -14,6 +14,7 @@ services:
       - MEDIAWIKI_LOGO_FILE
       - MEDIAWIKI_IS_PRIVATE
       - MEDIAWIKI_DEBUG
+      - MEDIAWIKI_LANGUAGE=${MEDIAWIKI_LANGUAGE:-en}
       - SAML_ENABLED
       - OPENID_ENABLED
       - DB_HOST=db