diff --git a/spec/ts-smoke/tsconfig.json b/spec/ts-smoke/tsconfig.json
index 4ab8887665c8..35f95b765351 100644
--- a/spec/ts-smoke/tsconfig.json
+++ b/spec/ts-smoke/tsconfig.json
@@ -5,6 +5,7 @@
           "es6",
           "dom"
       ],
+      "typeRoots" : ["../../node_modules/@types"],
       "noImplicitAny": true,
       "noImplicitThis": true,
       "strictNullChecks": false,