diff --git a/exec/load/http.js b/exec/load/http.js
index 4470981da52cc1593b403fc284c7e5f190e4cbd7..aeb94d81d7dddb88398de5ef8220f60842e2f9f1 100644
--- a/exec/load/http.js
+++ b/exec/load/http.js
@@ -49,7 +49,7 @@ HTTPRequest.prototype.AddExtraHeaders = function () {
 	var self = this;
 	Object.keys(this.extra_headers).forEach(
 		function (e) {
-			self.request_headers.push(e + ': ' + this.extra_headers[e]);
+			self.request_headers.push(e + ': ' + self.extra_headers[e]);
 		}
 	);
 };