diff --git a/telethon/network/tcp_transport.py b/telethon/network/tcp_transport.py
index c5f7a9df..98cb25e7 100644
--- a/telethon/network/tcp_transport.py
+++ b/telethon/network/tcp_transport.py
@@ -1,4 +1,4 @@
-from binascii import crc32
+from zlib import crc32
 from datetime import timedelta
 
 from ..errors import InvalidChecksumError