diff --git a/src/worker_loader.js b/src/worker_loader.js
index 8d342d116..cb0a91071 100644
--- a/src/worker_loader.js
+++ b/src/worker_loader.js
@@ -49,4 +49,4 @@ function onMessageLoader(evt) {
   }
 }
 
-this.onmessage = onMessageLoader.bind(this);
+this.onmessage = onMessageLoader;