diff --git a/Makefile.dryice.js b/Makefile.dryice.js
index 1d258db7..73abf1c1 100755
--- a/Makefile.dryice.js
+++ b/Makefile.dryice.js
@@ -417,9 +417,7 @@ var buildAce = function(options) {
             source: [{
                 project: workerProject,
                 require: [
-                    'ace/lib/fixoldbrowsers',
-                    'ace/lib/event_emitter',
-                    'ace/lib/oop',
+                    'ace/worker/worker',
                     'ace/mode/' + mode + '_worker'
                 ]
             }],
@@ -428,7 +426,6 @@ var buildAce = function(options) {
         });
         copy({
             source: [
-                ACE_HOME + "/lib/ace/worker/worker.js",
                 worker
             ],
             filter: options.compress ? [copy.filter.uglifyjs] : [],
diff --git a/build_support/mini_require.js b/build_support/mini_require.js
index ee0d22d6..44d2ed70 100644
--- a/build_support/mini_require.js
+++ b/build_support/mini_require.js
@@ -61,10 +61,13 @@ var _define = function(module, deps, payload) {
     if (arguments.length == 2)
         payload = deps;
 
-    if (!_define.modules)
-        _define.modules = {};
-
-    _define.modules[module] = payload;
+    if (!_define.modules) {
+        _define.modules = Object.create(null);
+        _define.payloads = Object.create(null);
+    }
+    
+    _define.payloads[module] = payload;
+    _define.modules[module] = null;
 };
 
 /**
@@ -130,30 +133,27 @@ var lookup = function(parentId, moduleName) {
 
     var module = _define.modules[moduleName];
     if (!module) {
-        return null;
+        module = _define.payloads[moduleName];
+        if (typeof module === 'function') {
+            var exports = {};
+            var mod = {
+                id: moduleName,
+                uri: '',
+                exports: exports,
+                packaged: true
+            };
+
+            var req = function(module, callback) {
+                return _require(moduleName, module, callback);
+            };
+
+            var returnValue = module(req, exports, mod);
+            exports = returnValue || mod.exports;
+            _define.modules[moduleName] = exports;
+            delete _define.payloads[moduleName];
+        }
+        module = _define.modules[moduleName] = exports;
     }
-
-    if (typeof module === 'function') {
-        var exports = {};
-        var mod = {
-            id: moduleName,
-            uri: '',
-            exports: exports,
-            packaged: true
-        };
-
-        var req = function(module, callback) {
-            return _require(moduleName, module, callback);
-        };
-
-        var returnValue = module(req, exports, mod);
-        exports = returnValue || mod.exports;
-
-        // cache the resulting module object for next time
-        _define.modules[moduleName] = exports;
-        return exports;
-    }
-
     return module;
 };
 
diff --git a/lib/ace/worker/worker.js b/lib/ace/worker/worker.js
index 96ab3989..b0f1a5e7 100644
--- a/lib/ace/worker/worker.js
+++ b/lib/ace/worker/worker.js
@@ -38,6 +38,10 @@ window.normalizeModule = function(parentId, moduleName) {
 };
 
 window.require = function(parentId, id) {
+    if (!id) {
+        id = parentId
+        parentId = null;
+    }
     if (!id.charAt)
         throw new Error("worker.js require() accepts only (parentId, id) as arguments");
 
@@ -58,7 +62,7 @@ window.require = function(parentId, id) {
     
     require.id = id;
     importScripts(path);
-    return require(parentId, id);    
+    return require(parentId, id);
 };
 
 require.modules = {};
@@ -102,8 +106,8 @@ window.initBaseUrls  = function initBaseUrls(topLevelNamespaces) {
 
 window.initSender = function initSender() {
 
-    var EventEmitter = require(null, "ace/lib/event_emitter").EventEmitter;
-    var oop = require(null, "ace/lib/oop");
+    var EventEmitter = require("ace/lib/event_emitter").EventEmitter;
+    var oop = require("ace/lib/oop");
     
     var Sender = function() {};
     
@@ -145,9 +149,9 @@ window.onmessage = function(e) {
     }
     else if (msg.init) {        
         initBaseUrls(msg.tlns);
-        require(null, "ace/lib/fixoldbrowsers");
+        require("ace/lib/es5-shim");
         sender = initSender();
-        var clazz = require(null, msg.module)[msg.classname];
+        var clazz = require(msg.module)[msg.classname];
         main = new clazz(sender);
     } 
     else if (msg.event && sender) {