diff --git a/scripts/change_url b/scripts/change_url
index 7e56cec..318ac92 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -9,6 +9,8 @@
 source _common.sh
 source /usr/share/yunohost/helpers
 
+key=$(ynh_string_random --length=50)
+
 #=================================================
 # STANDARD MODIFICATIONS
 #=================================================