diff --git a/index.js b/index.js
index ec1e47a..24a1b47 100644
--- a/index.js
+++ b/index.js
@@ -67,7 +67,7 @@ module.exports = function (opts) {
         if (first) this.queue(prelude + '({');
         entries = entries.filter(function (x) { return x !== undefined });
         
-        this.queue('},{},' + JSON.stringify(entries) + ')');
+        this.queue('},' + JSON.stringify(entries) + ')');
         if (sourcemap) this.queue('\n' + sourcemap.comment());
 
         this.queue(null);
diff --git a/prelude.js b/prelude.js
index ae8e72f..8861b2f 100644
--- a/prelude.js
+++ b/prelude.js
@@ -7,9 +7,10 @@
 // anything defined in a previous bundle is accessed via the
 // orig method which is the requireuire for previous bundles
 
-(function(modules, cache, entry) {
+(function(modules, entry) {
     // Save the require from previous bundle to this closure if any
     var previousRequire = typeof require == "function" && require;
+    var cache = {};
 
     function newRequire(name, jumped){
         if(!cache[name]) {
@@ -35,6 +36,13 @@
         }
         return cache[name].exports;
     }
+
+    // A means of resetting the module cache when necessary; for example,
+    // between test runs.
+    newRequire.dumpCache = function() {
+        cache = {};
+    };
+
     for(var i=0;i<entry.length;i++) newRequire(entry[i]);
 
     // Override the current require with this new one