diff --git a/MANIFEST.in b/MANIFEST.in
index 6f1f5b9..bd77688 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,8 +1,9 @@
 include Makefile
 include requirements*.txt
 include version.txt
 include README.md
+include conftest.py
 recursive-include swh/loader/package/tests/ *.tar.gz
 recursive-include swh py.typed
 recursive-include swh/loader/package/tests/data/ *
 recursive-include swh/loader/package/*/tests/data/ *