diff --git a/MANIFEST.in b/MANIFEST.in
index 78655a5f4..1947b9140 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,5 +1,5 @@
 recursive-include include *.h
-recursive-include spacy *.txt
+recursive-include spacy *.txt *.pyx *.pxd
 include LICENSE
 include README.md
 include bin/spacy