diff --git a/python/MANIFEST.in b/python/MANIFEST.in
index 8517867e76a421caabe29bbdf9cea86f2c04e907..20c559806d49ffe73a3a5b6ea5ce39f29c65328f 100644
--- a/python/MANIFEST.in
+++ b/python/MANIFEST.in
@@ -1,2 +1,4 @@
 include VERSION
 include Plumed.h
+include plumed.pyx
+include cplumed.pxd