diff --git a/package.json b/package.json
index f7fa21b..af6edf0 100644
--- a/package.json
+++ b/package.json
@@ -45,5 +45,8 @@
   },
   "testling": {
     "files": "test/test.js"
+  },
+  "engines": {
+    "node": ">= 0.4"
   }
 }