diff --git a/scripts/change_url b/scripts/change_url
index 4fc8d54..3ae2239 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -32,6 +32,7 @@ port=$(ynh_app_setting_get --app=$app --key=port)
 db_name=$(ynh_app_setting_get --app=$app --key=db_name)
 db_user=$db_name
 db_pwd=$(ynh_app_setting_get --app=$app --key=psqlpwd)
+secret=$(ynh_string_random --length=32)
 
 #=================================================
 # BACKUP BEFORE UPGRADE THEN ACTIVE TRAP