diff --git a/lib/application.js b/lib/application.js
index 34398a5..da7674e 100644
--- a/lib/application.js
+++ b/lib/application.js
@@ -229,5 +229,6 @@ function createContext() {
     this.req = req;
     this.res = res;
     this.cookies = new Cookies(req, res);
+    this.onerror = this.onerror.bind(this);
   }
 }