diff --git a/MANIFEST.in b/MANIFEST.in
index d4e0a6e..90ada32 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,4 +1,4 @@
 include LICENSE
 include README.md
 recursive-include include *.h
-recursive-include src *.h
+recursive-include src *.h *.hpp