diff --git a/package.json b/package.json
index ff5fc4c988..a240c5ee10 100644
--- a/package.json
+++ b/package.json
@@ -64,6 +64,7 @@
     "lazypipe": "^0.2.3",
     "lunr": "^0.5.12",
     "minimist": "^1.1.3",
+    "mkdirp": "^0.5.1",
     "node-html-encoder": "0.0.2",
     "node-libs-browser": "^0.5.2",
     "request": "2.53.0",