diff --git a/exemples/practica-final/install.yaml b/exemples/practica-final/install.yaml
index 185ae90..60462ee 100644
--- a/exemples/practica-final/install.yaml
+++ b/exemples/practica-final/install.yaml
@@ -82,7 +82,7 @@ spec:
           set -ex
           echo 'Starting init-mariadb'
           ls /mnt/config-map
-          [[ $(hostname) =~ -([0-9]+)$ ]] || exit 1
+          [[ $HOSTNAME =~ -([0-9]+)$ ]] || exit 1
           ordinal=${BASH_REMATCH[1]}
           if [[ $ordinal -eq 0 ]]; then
             cp /mnt/config-map/primary.cnf /etc/my.cnf.d/server-id.cnf