diff --git a/lib/ace/worker/worker_client.js b/lib/ace/worker/worker_client.js
index a992db8f..609e981c 100644
--- a/lib/ace/worker/worker_client.js
+++ b/lib/ace/worker/worker_client.js
@@ -56,14 +56,17 @@ var WorkerClient = function(topLevelNamespaces, packagedJs, mod, classname) {
             workerUrl = require.nameToUrl("ace/worker/worker_sourcemint");
         } else {
             // We are running in RequireJS.
-            workerUrl = this.$normalizePath(require.nameToUrl("ace/worker/worker", null, "_"));
+            // nameToUrl is renamed to toUrl in requirejs 2
+            if (require.nameToUrl && !require.toUrl)
+                require.toUrl = require.nameToUrl;
+            workerUrl = this.$normalizePath(require.toUrl("ace/worker/worker", null, "_"));
         }
         this.$worker = new Worker(workerUrl);
 
         var tlns = {};
         for (var i=0; i<topLevelNamespaces.length; i++) {
             var ns = topLevelNamespaces[i];
-            var path = this.$normalizePath(require.nameToUrl(ns, null, "_").replace(/.js$/, ""));
+            var path = this.$normalizePath(require.toUrl(ns, null, "_").replace(/.js$/, ""));
 
             tlns[ns] = path;
         }