diff --git a/b9/lib/js/package.json b/b9/lib/js/package.json
index 48327c81..d3822a45 100644
--- a/b9/lib/js/package.json
+++ b/b9/lib/js/package.json
@@ -4,6 +4,7 @@
   "dependencies": {
     "async": "^1.5.2",
     "lodash": "^4.2.1",
+    "mkdirp": "^0.5.1",
     "optimist": "^0.6.1"
   }
 }