diff --git a/MANIFEST.in b/MANIFEST.in
index d4e90927..91ca67ee 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,3 +1,4 @@
 include README.rst
 include atomman\VERSION
-include atomman\core\cythonized.pyx
\ No newline at end of file
+include atomman\core\cythonized.pyx
+graft tests