diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 4155e5d2..90e0cfda 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -7,6 +7,11 @@ Changelog
 .. This document is user facing. Please word the changes in such a way
 .. that users understand how the changes affect the new version.
 
+version 1.7.0-dev
+-----------------
++ Fix a bug where READ and WRITE in isal.igzip were inconsistent with the
+  values in gzip on Python 3.13
+
 version 1.6.1
 -----------------
 + Fix a bug where streams that were passed to igzip_threaded.open where closed.
diff --git a/src/isal/igzip.py b/src/isal/igzip.py
index 3c2ed2cb..4cab8e0f 100644
--- a/src/isal/igzip.py
+++ b/src/isal/igzip.py
@@ -55,7 +55,8 @@
 READ_BUFFER_SIZE = 512 * 1024
 
 FTEXT, FHCRC, FEXTRA, FNAME, FCOMMENT = 1, 2, 4, 8, 16
-READ, WRITE = 1, 2
+READ = gzip.READ
+WRITE = gzip.WRITE
 
 BadGzipFile = gzip.BadGzipFile  # type: ignore