diff --git a/MANIFEST.in b/MANIFEST.in
index e98d213..a367dc0 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,3 +1,4 @@
 include AUTHORS CHANGES LICENSE README.rst tox.ini .coveragerc
 recursive-include docs *
+recursive-include tests *
 prune docs/_build