diff --git a/dokogen/ui.py b/dokogen/ui.py
index ec02b92..e1820a0 100644
--- a/dokogen/ui.py
+++ b/dokogen/ui.py
@@ -5,6 +5,7 @@ import tkinter as tk
 from tkinter import ttk, messagebox, filedialog, simpledialog, scrolledtext
 import os
 import json
+import sys
 import threading
 from datetime import datetime
 from typing import List, Optional