diff --git a/src/matchmedia.polyfill.js b/src/matchmedia.polyfill.js
index 12d2b95f..6077e36c 100644
--- a/src/matchmedia.polyfill.js
+++ b/src/matchmedia.polyfill.js
@@ -33,4 +33,4 @@
 		};
 
 	}( w.document ));
-}( this ));
+}( window ));