diff --git a/scripts/upgrade b/scripts/upgrade
index 3e1a23e..42669cb 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -22,6 +22,7 @@ is_public=$(ynh_app_setting_get $app is_public)
 final_path=$(ynh_app_setting_get $app final_path)
 language=$(ynh_app_setting_get $app language)
 calibre_dir=$(ynh_app_setting_get $app calibre_dir)
+port=$(ynh_app_setting_get $app port)
 
 
 #=================================================