diff --git a/scripts/upgrade b/scripts/upgrade
index 3b1a5c2..e00b3c4 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -19,6 +19,7 @@ domain=$(ynh_app_setting_get $app domain)
 path_url=$(ynh_app_setting_get $app path)
 is_public=$(ynh_app_setting_get $app is_public)
 final_path=$(ynh_app_setting_get $app final_path)
+port=$(ynh_app_setting_get $app port)
 
 #=================================================
 # ENSURE DOWNWARD COMPATIBILITY