diff --git a/MANIFEST.in b/MANIFEST.in
index ab6473273c..5513a10fdf 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -3,3 +3,4 @@ include requirements.txt
 include README.md
 include LICENSE
 recursive-include tests *.py
+recursive-include tests/unit/testdata *