diff --git a/MANIFEST.in b/MANIFEST.in
index e2e23d2c..41db5797 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -5,6 +5,7 @@ include tests/testdata/test-1.0-py2.py3-none-any.whl
 include tox.ini
 include manpages/*.rst
 include LICENSE.txt
+include src/wheel/vendored/vendor.txt
 prune tests/testdata/*/build
 prune tests/testdata/*/dist
 prune tests/testdata/*/*.egg-info
diff --git a/src/wheel/vendored/vendor.txt b/src/wheel/vendored/vendor.txt
new file mode 100644
index 00000000..99f51222
--- /dev/null
+++ b/src/wheel/vendored/vendor.txt
@@ -0,0 +1 @@
+packaging==20.8