diff --git a/scripts/install b/scripts/install
index 682664e..6f42d57 100755
--- a/scripts/install
+++ b/scripts/install
@@ -33,7 +33,8 @@ password=$YNH_APP_ARG_PASSWORD
 instance_name=$YNH_APP_ARG_NAME
 registration=$YNH_APP_ARG_REGISTRATION
 admin_email=$(ynh_user_get_info $admin 'mail')
-secret_key="$(ynh_string_random 256)="
+secret_key=$(ynh_string_random 32)
+secret_key="${secret_key}="
 
 ### If it's a multi-instance app, meaning it can be installed several times independently
 ### The id of the app as stated in the manifest is available as $YNH_APP_ID