diff --git a/package.json b/package.json
index 053236f835..2bf5163bb1 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
     "url": "https://github.com/angular/angular.git"
   },
   "scripts": {
-    "postinstall": "node tools/npm/copy-npm-shrinkwrap"
+    "postinstall": "node tools/npm/copy-npm-shrinkwrap; tsd reinstall --overwrite --clean --config ./tsd.json"
   },
   "dependencies": {
     "es6-shim": "^0.35.0",