diff --git a/es5-shim.js b/es5-shim.js
index d768f9e0..6508bbf5 100644
--- a/es5-shim.js
+++ b/es5-shim.js
@@ -29,6 +29,9 @@
     // RequireJS
     if (typeof define == "function") {
         define(definition);
+    // YUI3
+    } else if (typeof YUI == "function") {
+        YUI.add("es5", definition);
     // CommonJS and <script>
     } else {
         definition();
diff --git a/es5-shim.min.js b/es5-shim.min.js
index b1e6f09f..faa02aea 100644
--- a/es5-shim.min.js
+++ b/es5-shim.min.js
@@ -1,16 +1,18 @@
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