diff --git a/build/package.json b/build/package.json
index 1d97358fa..8fe89a79e 100644
--- a/build/package.json
+++ b/build/package.json
@@ -31,6 +31,7 @@
     "request": "~2.27.0",
     "rimraf": "~2.2.2",
     "runas": "~0.3.0",
+    "underscore-plus": "1.x",
     "unzip": "~0.1.9",
     "vm-compatibility-layer": "~0.1.0",
     "walkdir": "0.0.7"