diff --git a/mariadb/stack.yml b/mariadb/stack.yml
index f03f742cd8b4..d5b571712ddb 100644
--- a/mariadb/stack.yml
+++ b/mariadb/stack.yml
@@ -7,7 +7,7 @@ services:
     image: mariadb
     restart: always
     environment:
-      MYSQL_ROOT_PASSWORD: example
+      MARIADB_ROOT_PASSWORD: example
 
   adminer:
     image: adminer