diff --git a/package.json b/package.json
index 4e6b8a2..85c8916 100644
--- a/package.json
+++ b/package.json
@@ -17,6 +17,7 @@
     "index.js",
     "ponyfill.js",
     "index.d.ts",
+    "ponyfill.d.ts",
     "es/index.js",
     "es/ponyfill.js",
     "lib/index.js",