diff --git a/scripts/backup b/scripts/backup
index 86f8952..85799e7 100755
--- a/scripts/backup
+++ b/scripts/backup
@@ -24,6 +24,8 @@ ynh_abort_if_errors
 #=================================================
 ynh_print_info --message="Loading installation settings..."
 
+app=$YNH_APP_INSTANCE_NAME
+
 final_path=$(ynh_app_setting_get --app=$app --key=final_path)
 domain=$(ynh_app_setting_get --app=$app --key=domain)