diff --git a/MANIFEST.in b/MANIFEST.in
index e2c7895..ecd503f 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,4 +1,4 @@
-recursive-include tests *.py
+graft tests
 recursive-include docs/source *
 include docs/Makefile
 include *.py