diff --git a/lib/cluster.js b/lib/cluster.js
index f62e8abd1b..8f7df3e126 100644
--- a/lib/cluster.js
+++ b/lib/cluster.js
@@ -41,11 +41,13 @@ if (process.env.NODE_DEBUG && /cluster/.test(process.env.NODE_DEBUG)) {
 }
 
 // cluster object:
-function cluster() {
+function Cluster() {
   EventEmitter.call(this);
 }
-util.inherits(cluster, EventEmitter);
-var cluster = module.exports = new cluster();
+
+util.inherits(Cluster, EventEmitter);
+
+var cluster = module.exports = new Cluster();
 
 // Used in the master:
 var masterStarted = false;