diff --git a/test/mocks/request.js b/test/mocks/request.js
index b2b2da7b8..01314c6e0 100644
--- a/test/mocks/request.js
+++ b/test/mocks/request.js
@@ -12,6 +12,7 @@ var http = require('http');
 function MockRequest() {
   sinon.stub(this, 'end');
   sinon.stub(this, 'write');
+  sinon.stub(this, 'setHeader');
   this.log = sinon.stub(this.log);
 }
-util.inherits(MockRequest, http.ClientRequest);
\ No newline at end of file
+util.inherits(MockRequest, http.ClientRequest);