diff --git a/scripts/change_url b/scripts/change_url
index c375609..002e1f7 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -9,6 +9,9 @@
 source _common.sh
 source /usr/share/yunohost/helpers
 
+timezone="$(cat /etc/timezone)"
+key=$(ynh_string_random --length=18)
+
 #=================================================
 # MODIFY URL IN NGINX CONF
 #=================================================