diff --git a/src/TemplateBinding.js b/src/TemplateBinding.js
index 374561a..9906c5b 100644
--- a/src/TemplateBinding.js
+++ b/src/TemplateBinding.js
@@ -1283,4 +1283,4 @@
 
   // Polyfill-specific API.
   HTMLTemplateElement.forAllTemplatesFrom_ = forAllTemplatesFrom;
-})(this);
+})(window);