diff --git a/scripts/upgrade b/scripts/upgrade
index 6c95f36..a0e7c76 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -61,6 +61,12 @@ if [ -z "$final_path" ]; then
 	ynh_app_setting_set --app=$app --key=final_path --value=$final_path
 fi
 
+# If final_path doesn't exist, create it
+if [ -z "$port" ]; then
+	port=$(ynh_find_port --port=6000)
+	ynh_app_setting_set --app=$app --key=port --value=$port
+fi
+
 # If new datadir doesn't exist, create it
 if [ -z "/home/yunohost.app/$app" ]; then
         datadir=/home/yunohost.app/$app