diff --git a/Misc/NEWS b/Misc/NEWS
index 8efe3860fbb..161b802de3f 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -207,5 +207,7 @@ Documentation
 Tools/Demos
 -----------
 
+- Issue #15378: Fix Tools/unicode/comparecodecs.py.  Patch by Serhiy Storchaka.
+
 
 **(For information about older versions, consult the HISTORY file.)**
diff --git a/Tools/unicode/comparecodecs.py b/Tools/unicode/comparecodecs.py
index 7de14fdc27e..6525ddf3e1a 100644
--- a/Tools/unicode/comparecodecs.py
+++ b/Tools/unicode/comparecodecs.py
@@ -30,7 +30,7 @@ def compare_codecs(encoding1, encoding2):
             mismatch += 1
     # Check decoding
     for i in range(256):
-        c = chr(i)
+        c = bytes([i])
         try:
             u1 = c.decode(encoding1)
         except UnicodeError: