diff --git a/MANIFEST.in b/MANIFEST.in
index bb14403d..69c8a787 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,6 +1,8 @@
 recursive-include src/dependency_injector *.py *.pyx *.pxd *.c
+recursive-include tests *.py
 include README.rst
 include CONTRIBUTORS.rst
 include LICENSE.rst
 include requirements.txt
 include setup.py
+include tox.ini