diff --git a/package.json b/package.json
index 775c029..d5d61c6 100644
--- a/package.json
+++ b/package.json
@@ -22,6 +22,7 @@
   "devDependencies": {
     "request": "1.9.x",
     "vows": "0.5.x",
+    "async": "0.1.x",
     "socket.io": "0.6.x"
   },
   "main": "./lib/node-http-proxy",