diff --git a/MANIFEST.in b/MANIFEST.in
index 040a4bc6..f60f3f11 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -2,4 +2,5 @@ include test-requirements.txt
 include requirements.txt
 include requirements3.txt
 include README.md
-include LICENSE
\ No newline at end of file
+include LICENSE
+recursive-include tests *.py