diff --git a/Lib/zipfile/__init__.py b/Lib/zipfile/__init__.py
index 95c047991f8..116b939e55f 100644
--- a/Lib/zipfile/__init__.py
+++ b/Lib/zipfile/__init__.py
@@ -352,6 +352,8 @@ def _sanitize_filename(filename):
     # ZIP format specification.
     if os.sep != "/" and os.sep in filename:
         filename = filename.replace(os.sep, "/")
+    if os.altsep and os.altsep != "/" and os.altsep in filename:
+        filename = filename.replace(os.altsep, "/")
     return filename
 
 
diff --git a/Misc/NEWS.d/next/Library/2022-05-02-16-21-05.gh-issue-92184.hneGVW.rst b/Misc/NEWS.d/next/Library/2022-05-02-16-21-05.gh-issue-92184.hneGVW.rst
new file mode 100644
index 00000000000..65dbdc9f603
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2022-05-02-16-21-05.gh-issue-92184.hneGVW.rst
@@ -0,0 +1,3 @@
+When creating zip files using :mod:`zipfile`, ``os.altsep``, if not ``None``,
+will always be treated as a path separator even when it is not ``/``.
+Patch by Carey Metcalfe.