diff --git a/lib/javascript-static.js b/lib/javascript-static.js
index 2641a9f5dd5..349d7ebfa05 100644
--- a/lib/javascript-static.js
+++ b/lib/javascript-static.js
@@ -9,6 +9,8 @@ M.yui.add_module = function(modules) {
     for (var modname in modules) {
         YUI_config.modules[modname] = modules[modname];
     }
+    // Ensure thaat the YUI_config is applied to the main YUI instance.
+    Y.applyConfig(YUI_config);
 };
 /**
  * The gallery version to use when loading YUI modules from the gallery.