diff --git a/package.json b/package.json
index 711076cd23..3170761fa4 100644
--- a/package.json
+++ b/package.json
@@ -50,6 +50,7 @@
     "serve-static": "^1.9.2",
     "source-map-support": "^0.2.10",
     "through2": "^0.6.3",
+    "traceur-runtime": "0.0.59",
     "typescript": "^1.5.3",
     "vinyl": "^0.4.6",
     "yargs": "^3.6.0"