#13054: fix usage of sys.maxunicode after PEP-393.
diff --git a/Tools/unicode/comparecodecs.py b/Tools/unicode/comparecodecs.py
index 0f5c1e2..7de14fd 100644
--- a/Tools/unicode/comparecodecs.py
+++ b/Tools/unicode/comparecodecs.py
@@ -14,7 +14,7 @@
     print('Comparing encoding/decoding of   %r and   %r' % (encoding1, encoding2))
     mismatch = 0
     # Check encoding
-    for i in range(sys.maxunicode):
+    for i in range(sys.maxunicode+1):
         u = chr(i)
         try:
             c1 = u.encode(encoding1)