diff --git a/scripts/backup b/scripts/backup
index 4e4230b..f501e0e 100644
--- a/scripts/backup
+++ b/scripts/backup
@@ -27,9 +27,9 @@ ynh_abort_if_errors
 
 app=$YNH_APP_INSTANCE_NAME
 
-final_path=$(ynh_app_setting_get $app final_path)
-domain=$(ynh_app_setting_get $app domain)
-db_name=$(ynh_app_setting_get $app psql_db)
+final_path=$(ynh_app_setting_get "$app" final_path)
+domain=$(ynh_app_setting_get "$app" domain)
+db_name=$(ynh_app_setting_get "$app" psql_db)
 
 #=================================================
 # STANDARD BACKUP STEPS