diff --git a/update-wp-admin-user.sh b/update-wp-admin-user.sh
index eaae108..8347ca2 100755
--- a/update-wp-admin-user.sh
+++ b/update-wp-admin-user.sh
@@ -25,7 +25,7 @@ echo "using wordpress-username $WORDPRESS_USERNAME"
 echo "using wordpress-email $WORDPRESS_EMAIL"
 
 echo "create admin user if not exists otherwise update admin user..."
-wp user list --field=user_login | grep "$WORDPRESS_USERNAME" && wp user update $WORDPRESS_USERNAME --user_pass="$WORDPRESS_PASSWORD" --user_email="$WORDPRESS_EMAIL" --skip-email --allow-root || wp user create "$WORDPRESS_USERNAME" "$WORDPRESS_EMAIL" --role=administrator --user_pass="$WORDPRESS_PASSWORD"
+wp user list --field=user_login | grep -x "$WORDPRESS_USERNAME" && wp user update $WORDPRESS_USERNAME --user_pass="$WORDPRESS_PASSWORD" --user_email="$WORDPRESS_EMAIL" --skip-email --allow-root || wp user create "$WORDPRESS_USERNAME" "$WORDPRESS_EMAIL" --role=administrator --user_pass="$WORDPRESS_PASSWORD"
 
 for number in {2..9}; do