diff --git a/telethon/telegram_client.py b/telethon/telegram_client.py
index c6123d2c..0a1e899f 100644
--- a/telethon/telegram_client.py
+++ b/telethon/telegram_client.py
@@ -7,6 +7,7 @@ import logging
 import os
 import re
 import sys
+import time
 import warnings
 from collections import UserList
 from datetime import datetime, timedelta