diff --git a/scripts/change_url b/scripts/change_url
index 5e28721..f389245 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -11,9 +11,17 @@ source ./_common.sh
 
 # Retrive arguments
 old_domain=$YNH_APP_OLD_DOMAIN
-old_path=$(ynh_normalize_url_path $YNH_APP_OLD_PATH)
+old_path=$YNH_APP_OLD_PATH
+
 new_domain=$YNH_APP_NEW_DOMAIN
-new_path=$(ynh_normalize_url_path $YNH_APP_NEW_PATH)
+new_path=$YNH_APP_NEW_PATH
+
+test -n "$old_path" || old_path="/"
+test -n "$new_path" || new_path="/"
+
+new_path=$(ynh_normalize_url_path $new_path)
+old_path=$(ynh_normalize_url_path $old_path)
+
 http_port=$(ynh_app_setting_get "$app" http_port)
 
 # CHECK WHICH PARTS SHOULD BE CHANGED