diff --git a/Lib/zipfile.py b/Lib/zipfile.py
index 97f639d..b274682 100644
--- a/Lib/zipfile.py
+++ b/Lib/zipfile.py
@@ -428,7 +428,7 @@
            read a whole line.
         """
         if size < 0:
-            size = sys.maxint
+            size = sys.maxsize
         elif size == 0:
             return b''