diff --git a/MANIFEST.in b/MANIFEST.in
index 09ed02057e794b6b192d967bd6702ffe070c6bce..556c49dbd97387e4adc7bb046457e0c084788481 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,3 +1,3 @@
 include LICENSE README.rst bootstrap.py buildout.cfg
 recursive-include doc conf.py *.rst
-recursive-include xbob *.cpp *.h
+recursive-include xbob/learn/activation *.cpp *.h