diff --git a/MANIFEST.in b/MANIFEST.in
index e33e88d7..6470b860 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -3,6 +3,7 @@ include LICENSE.txt
 include panel/.version
 include panel/*.json
 include panel/assets/*.gif
+include panel/index.ts
 include panel/models/*.ts
 include panel/models/vtk/*.ts
 include panel/_templates/*.js
