diff --git a/aio/src/tsconfig.app.json b/aio/src/tsconfig.app.json
index ed04bb91fd..c486ae3a7c 100644
--- a/aio/src/tsconfig.app.json
+++ b/aio/src/tsconfig.app.json
@@ -4,7 +4,8 @@
     "outDir": "../out-tsc/app",
     "module": "es2015",
     "baseUrl": "",
-    "types": []
+    "types": [],
+    "importHelpers": true
   },
   "exclude": [
     "testing/**/*",