diff --git a/package.json b/package.json
index 61c16ae..f5c3225 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,8 @@
   , "bugs": {"url": "https://github.com/troygoode/node-cors/issues"}
   , "main": "./lib/index.js"
   , "engines": {
-      "node": ">=0.8.0"
+      "node": ">=0.8.0",
+      "npm": "^1.2"
   }
   , "dependencies": {}
   , "devDependencies": {