diff --git a/lib/App.server.js b/lib/App.server.js
index c926c2904..21c731f06 100644
--- a/lib/App.server.js
+++ b/lib/App.server.js
@@ -141,7 +141,7 @@ App.prototype._writeScripts = function (dir, source, map, options) {
 App.prototype.writeScripts = function(store, dir, options, cb) {
   var app = this;
   // racer-bundle will call this whenever it rebundles the app
-  options.onRebundle = function(source, map, options) {
+  options.onRebundle = function(err, source, map, options) {
     app._writeScripts(dir, source, map, options);
     app._refreshScripts();
   };