diff --git a/MANIFEST.in b/MANIFEST.in
index 0561cc74c..04b3e1fb9 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -11,3 +11,4 @@ recursive-include docs *
 prune docs/build
 recursive-include extras *
 recursive-include bin *
+recursive-include tests *