diff --git a/MANIFEST.in b/MANIFEST.in
index 1c26ae16fc78a..5047a3f4b99f9 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -39,6 +39,7 @@ graft test-data
 include conftest.py
 include runtests.py
 include pytest.ini
+include tox.ini
 
 include LICENSE mypyc/README.md
 exclude .gitmodules CONTRIBUTING.md CREDITS ROADMAP.md tox.ini action.yml .editorconfig