diff --git a/MANIFEST.in b/MANIFEST.in
index dfb7c9d28..216df265b 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -14,6 +14,7 @@ recursive-include docs *
 recursive-include res *
 recursive-include scripts *
 recursive-include scripts-dev *
+recursive-include synapse *.pyi
 recursive-include tests *.py
 
 recursive-include synapse/static *.css