diff --git a/Tools/unicode/makeunicodedata.py b/Tools/unicode/makeunicodedata.py
index 3778efa..5b5b5dc 100644
--- a/Tools/unicode/makeunicodedata.py
+++ b/Tools/unicode/makeunicodedata.py
@@ -948,7 +948,7 @@
             n >>= 1
             maxshift += 1
     del n
-    bytes = sys.maxint  # smallest total size so far
+    bytes = sys.maxsize  # smallest total size so far
     t = tuple(t)    # so slices can be dict keys
     for shift in range(maxshift + 1):
         t1 = []