diff --git a/tests/mariadb.yml b/tests/mariadb.yml
index c41f52f..4bb8de5 100644
--- a/tests/mariadb.yml
+++ b/tests/mariadb.yml
@@ -20,7 +20,7 @@ services:
 
   onlyoffice-mariadb:
     container_name: onlyoffice-mariadb
-    image: mariadb:{MARIADB_VERSION:-10.5}
+    image: mariadb:${MARIADB_VERSION:-10.5}
     environment:
       - MYSQL_DATABASE=${MYSQL_DATABASE:-onlyoffice}
       - MYSQL_USER=${MYSQL_USER:-onlyoffice}